Attachment 347517 Details for Bug 188496 – Try to fix Windows/GTK builds (2)

[patch] Try to fix Windows/GTK builds (2)

bug-188496-20180820112955.patch (text/plain), 147.05 KB, created by Wenson Hsieh on 2018-08-20 11:29:56 PDT

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Creator: Wenson Hsieh

Created: 2018-08-20 11:29:56 PDT

Size: 147.05 KB

patch

obsolete

>Subversion Revision: 235065
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 70bd1a9cd7558064b57c991ae1cbb4050ab43f7a..4da3a264ecdc12dbaa089ffdbf2ced3f73b6cee1 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,125 @@
>+2018-08-20  Wenson Hsieh  <wenson_hsieh@apple.com>
>+
>+        [Attachment Support] Augment _WKAttachment SPI to handle NSFileWrappers in addition to NSData
>+        https://bugs.webkit.org/show_bug.cgi?id=188496
>+        <rdar://problem/43216836>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Refactors logic around HTMLAttachmentElement and pasteboard reading helpers, in support of moving the data
>+        backing for attachment elements to the client layer, instead of keeping it in the attachment element's File.
>+        Augmented existing API tests in WKAttachmentTests, and also added a new API test (see Tools for more detail).
>+
>+        * WebCore.xcodeproj/project.pbxproj:
>+        * dom/Document.cpp:
>+        (WebCore::Document::didInsertAttachmentElement):
>+
>+        Notify the client layer when a newly inserted attachment element's identifier has been updated to avoid
>+        colliding with the identifier of an existing attachment element. This can happen if, for instance, one or more
>+        attachments are copied and pasted within the same document.
>+
>+        * editing/Editor.cpp:
>+        (WebCore::Editor::registerAttachmentIdentifier):
>+        (WebCore::Editor::cloneAttachmentData):
>+
>+        Add new helper functions to notify the client when the attachment identifier to data mapping needs to be
>+        updated. This can happen in three ways: (1) an attachment is created with raw data, or (2) an attachment is
>+        created with a file path, or (3) the unique identifier for an attachment element has been reassigned. These
>+        correspond to the two versions of `registerAttachmentIdentifier`, and `cloneAttachmentData`, respectively.
>+
>+        (WebCore::EditorClient::supportsClientSideAttachmentData const):
>+
>+        Add a new EditorClient hook to determine whether client-side attachment data management is supported. Currently,
>+        this only returns true for WebKit2. If this flag is set to true, we register attachment identifiers and don't
>+        create a new File object for the attachment element; otherwise, fall back to creating and setting a File for the
>+        new attachment element.
>+
>+        (WebCore::Editor::insertAttachment):
>+        (WebCore::Editor::insertAttachmentFromFile): Deleted.
>+
>+        Adjust logic when inserting an attachment; we now only need to update the attributes of the attachment element
>+        with metadata from the client layer.
>+
>+        * editing/Editor.h:
>+        * editing/cocoa/WebContentReaderCocoa.mm:
>+        (WebCore::supportsClientSideAttachmentData):
>+        (WebCore::createFragmentForImageAttachment):
>+
>+        Notify the client when creating an attachment element from image data on the pasteboard.
>+
>+        (WebCore::replaceRichContentWithAttachments):
>+
>+        Refactor this helper function to no longer connect attachment elements to File objects created from
>+        subresources. Instead, just update each attachment element's attributes using information about the subresource,
>+        and then notify the client about the new attachment data and attachment identifier.
>+
>+        (WebCore::createFragmentAndAddResources):
>+        (WebCore::sanitizeMarkupWithArchive):
>+
>+        Plumb the current WebContentReader's Frame& to each of these helpers, so that it can call out to the client.
>+
>+        (WebCore::WebContentReader::readWebArchive):
>+        (WebCore::WebContentMarkupReader::readWebArchive):
>+        (WebCore::WebContentReader::readImage):
>+        (WebCore::WebContentReader::readFilePaths):
>+
>+        Notify the client when creating an attachment from the path of a dropped file.
>+
>+        * html/AttachmentTypes.h:
>+
>+        Remove AttachmentInfo. This is no longer necessary because we don't need to request attachment data from the web
>+        process anymore.
>+
>+        * html/HTMLAttachmentElement.cpp:
>+        (WebCore::HTMLAttachmentElement::ensureUniqueIdentifier):
>+
>+        Add a helper function on the attachment element to create and return a unique identifier if needed.
>+
>+        (WebCore::HTMLAttachmentElement::updateAttributes):
>+
>+        Add a helper method to update the displayed element attributes (type, title and subtitle) or an attachment.
>+
>+        (WebCore::AttachmentDataReader::create): Deleted.
>+        (WebCore::AttachmentDataReader::AttachmentDataReader): Deleted.
>+
>+        Remove AttachmentDataReader. This helper class was only used to load attachment data when requesting attachment
>+        information in the client, but this is now obviated by moving attachment data to the client layer.
>+
>+        (): Deleted.
>+        (WebCore::HTMLAttachmentElement::updateFileWithData): Deleted.
>+        (WebCore::HTMLAttachmentElement::requestInfo): Deleted.
>+        (WebCore::HTMLAttachmentElement::destroyReader): Deleted.
>+        (WebCore::AttachmentDataReader::~AttachmentDataReader): Deleted.
>+        (WebCore::AttachmentDataReader::didFinishLoading): Deleted.
>+        (WebCore::AttachmentDataReader::didFail): Deleted.
>+        (WebCore::AttachmentDataReader::invokeCallbackAndFinishReading): Deleted.
>+        * html/HTMLAttachmentElement.h:
>+        * page/DragClient.h:
>+        * page/DragController.cpp:
>+        (WebCore::DragController::startDrag):
>+        (WebCore::DragController::doSystemDrag):
>+        (WebCore::DragController::promisedAttachmentInfo):
>+
>+        Allow dragging an attachment (even if it does not have a file) as long as it has a unique identifier and a
>+        content type.
>+
>+        (WebCore::DragController::promisedBlobInfo): Deleted.
>+        * page/DragController.h:
>+        * page/EditorClient.h:
>+        (WebCore::EditorClient::registerAttachmentIdentifier):
>+        (WebCore::EditorClient::cloneAttachmentData):
>+        * platform/DragItem.h:
>+        (WebCore::DragItem::encode const):
>+        (WebCore::DragItem::decode):
>+        * platform/PromisedAttachmentInfo.h: Renamed from Source/WebCore/platform/PromisedBlobInfo.h.
>+
>+        Add an attachment identifier to PromisedBlobInfo. Additionally, rename PromisedBlobInfo to
>+        PromisedAttachmentInfo, since it is currently exclusively used to attachment element data to the pasteboard.
>+        In the future, this could be renamed to something more general (e.g. PromisedPasteboardData), should we use this
>+        mechanism to write data from other sources to the pasteboard.
>+
>+        (WebCore::PromisedAttachmentInfo::operator bool const):
>+
> 2018-08-20  Rob Buis  <rbuis@igalia.com>
> 
>         Throw an exception if window.open() gets passed a URL that cannot be parsed
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 65f4f102ac5f23d0bbaab46c05b406eb0ed4a9bb..52aa44aed045d3406d75e2251fced77bf1832fb0 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,188 @@
>+2018-08-20  Wenson Hsieh  <wenson_hsieh@apple.com>
>+
>+        [Attachment Support] Augment _WKAttachment SPI to handle NSFileWrappers in addition to NSData
>+        https://bugs.webkit.org/show_bug.cgi?id=188496
>+        <rdar://problem/43216836>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Adjusts WebKit's attachment editing SPI with the following modifications:
>+        â¢   Deprecate `-_insertAttachmentWithFilename:contentType:data:options:completion:` in favor of
>+            `-_insertAttachmentWithFileWrapper:contentType:options:completion:`.
>+        â¢   Deprecate `-requestInfo:` and in favor of just `-info`.
>+        â¢   Add a `-fileWrapper` property to `_WKAttachmentInfo` that returns an `NSFileWrapper`.
>+        â¢   Remove some SPI methods that would otherwise be deprecated, but are not even necessary, since they're no
>+            longer even used by Mail.
>+
>+        To make this possible, we refactor where and how attachment data is tracked. Currently, the data is stored in
>+        the network process, and made accessible to the web process via blob URLs stored in the File object in the
>+        attachment element. As such, requests from the UI process for attachment data would first be routed through the
>+        web process to network process and back.
>+
>+        Instead, we now keep the relevant attachment data (in the form of NSFileWrapper on Cocoa platforms) in the UI
>+        process, on API::Attachment. We additionally keep a map of attachment identifiers to API::Attachments, which
>+        allows us to propagate the same _WKAttachment wrapper object to the SPI client for each uniquely identified
>+        attachment element. This also has the benefit of allowing us to remove the asynchronous version of `-requestInfo:`
>+        and replace it with just an `info` property.
>+
>+        Changes are covered by new and existing API tests.
>+
>+        * CMakeLists.txt:
>+
>+        Add APIAttachment.cpp, which was previously absent from the WebKit CMakeList.
>+
>+        * Scripts/webkit/messages.py:
>+        * Shared/WebCoreArgumentCoders.cpp:
>+        (IPC::ArgumentCoder<PromisedAttachmentInfo>::encode):
>+        (IPC::ArgumentCoder<PromisedAttachmentInfo>::decode):
>+        (IPC::ArgumentCoder<PromisedBlobInfo>::encode): Deleted.
>+        (IPC::ArgumentCoder<PromisedBlobInfo>::decode): Deleted.
>+        (IPC::ArgumentCoder<AttachmentInfo>::encode): Deleted.
>+        (IPC::ArgumentCoder<AttachmentInfo>::decode): Deleted.
>+        * Shared/WebCoreArgumentCoders.h:
>+
>+        Continue removing encoding support for WebCore::AttachmentInfo. Additionally, rename PromisedBlobInfo to
>+        PromisedAttachmentInfo.
>+
>+        * UIProcess/API/APIAttachment.cpp:
>+        (API::Attachment::updateAttributes):
>+
>+        Rename setDataAndContentType to just updateAttributes; instead of sending data, only send the information needed
>+        to update the presentational attributes of the attachment element.
>+
>+        (API::Attachment::requestInfo): Deleted.
>+
>+        Just call the completion handler with the result of `self.info`.
>+
>+        (API::Attachment::setDataAndContentType): Deleted.
>+        * UIProcess/API/APIAttachment.h:
>+
>+        Add additional attributes: a content type, a file path, and (on Cocoa platforms) an NSFileWrapper.
>+
>+        * UIProcess/API/Cocoa/WKUIDelegatePrivate.h:
>+
>+        Remove -_webView:didInsertAttachment:, since this is unused by any client currently, and is superceded by
>+        -_webView:didInsertAttachment:withSource:.
>+
>+        * UIProcess/API/Cocoa/WKWebView.mm:
>+        (-[WKWebView _didInsertAttachment:withSource:]):
>+        (-[WKWebView _didRemoveAttachment:]):
>+
>+        Look up the API::Attachment corresponding to the identifier, and send its wrapper object to the client.
>+
>+        (-[WKWebView _insertAttachmentWithFilename:contentType:data:options:completion:]):
>+        (-[WKWebView _insertAttachmentWithFileWrapper:contentType:options:completion:]):
>+
>+        Add a way to insert an attachment using NSFileWrapper, and reimplement _insertAttachmentWithFilename: using it.
>+
>+        * UIProcess/API/Cocoa/WKWebViewPrivate.h:
>+        * UIProcess/API/Cocoa/_WKAttachment.h:
>+        * UIProcess/API/Cocoa/_WKAttachment.mm:
>+        (-[_WKAttachmentInfo initWithFileWrapper:filePath:contentType:]):
>+        (-[_WKAttachmentInfo data]):
>+        (-[_WKAttachmentInfo name]):
>+        (isDeclaredOrDynamicTypeIdentifier):
>+        (-[_WKAttachmentInfo _typeIdentifierFromPathExtension]):
>+        (-[_WKAttachmentInfo contentType]):
>+        (-[_WKAttachmentInfo mimeType]):
>+        (-[_WKAttachmentInfo utiType]):
>+        (-[_WKAttachmentInfo fileWrapper]):
>+        (-[_WKAttachment info]):
>+        (-[_WKAttachment requestInfo:]):
>+
>+        Add a property on _WKAttachment to retrieve a _WKAttachmentInfo (a snapshot of the current state of the
>+        attachment, along with the NSFileWrapper). Reimplement requestInfo using this property.
>+
>+        (-[_WKAttachment setFileWrapper:contentType:completion:]):
>+        (-[_WKAttachment setData:newContentType:newFilename:completion:]):
>+
>+        Reimplemented by calling -setFileWrapper:contentType:completion: with an NSFileWrapper created using the given
>+        data. Additionally, create and associate the unique identifier with an API::Attachment right away.
>+
>+        (-[_WKAttachment uniqueIdentifier]):
>+        (-[_WKAttachment description]):
>+        (-[_WKAttachmentInfo initWithInfo:]): Deleted.
>+        (-[_WKAttachmentInfo fileLoadingError]): Deleted.
>+        (-[_WKAttachment isEqual:]): Deleted.
>+        (-[_WKAttachment hash]): Deleted.
>+
>+        There's no longer any point to implementing these methods, since the SPI client is now guaranteed a unique
>+        mapping of _WKAttachments to attachment elements in the document.
>+
>+        * UIProcess/Cocoa/PageClientImplCocoa.mm:
>+        (WebKit::PageClientImplCocoa::didInsertAttachment):
>+        * UIProcess/Cocoa/WebPageProxyCocoa.mm:
>+        (WebKit::WebPageProxy::platformRegisterAttachment):
>+        (WebKit::WebPageProxy::platformCloneAttachment):
>+
>+        Extend the behavior of registering new attachment data on Cocoa platforms by additionally creating and setting
>+        NSFileWrappers on the API::Attachment.
>+
>+        * UIProcess/WebPageProxy.cpp:
>+        (WebKit::WebPageProxy::resetStateAfterProcessExited):
>+
>+        Clear out the map of attachment identifiers to API::Attachments when the web content process is terminated.
>+
>+        (WebKit::WebPageProxy::attachmentForIdentifier const):
>+
>+        Helper function to look up an API::Attachment for the given attachment identifier. Returns null if the
>+        attachment is not found, or the attachment identifier is invalid.
>+
>+        (WebKit::WebPageProxy::insertAttachment):
>+        (WebKit::WebPageProxy::updateAttachmentAttributes):
>+        (WebKit::WebPageProxy::registerAttachmentIdentifierFromData):
>+        (WebKit::WebPageProxy::registerAttachmentIdentifierFromFilePath):
>+        (WebKit::WebPageProxy::cloneAttachmentData):
>+        (WebKit::WebPageProxy::platformRegisterAttachment):
>+        (WebKit::WebPageProxy::platformCloneAttachment):
>+        (WebKit::WebPageProxy::didInsertAttachment):
>+
>+        Create an entry in the attachment identifier to API::Attachment map when an attachment is inserted, if one does
>+        not already exist. An attachment mapping would not exist only in the case where an attachment element was
>+        created via bindings; in this case, the client wouldn't have access to an NSFileWrapper containing the contents
>+        of the file; in the future, this can be improved by adding a mechanism to register an attachment element with
>+        this data, but for now, this is unnecessary for Mail's purposes.
>+
>+        (WebKit::WebPageProxy::didRemoveAttachment):
>+        (WebKit::WebPageProxy::ensureAttachment):
>+
>+        Ensures an attachment identifier to API::Attachment mapping.
>+
>+        (WebKit::WebPageProxy::attachmentInfoCallback): Deleted.
>+        (WebKit::WebPageProxy::requestAttachmentInfo): Deleted.
>+        (WebKit::WebPageProxy::setAttachmentDataAndContentType): Deleted.
>+        * UIProcess/WebPageProxy.h:
>+        * UIProcess/WebPageProxy.messages.in:
>+        * UIProcess/ios/PageClientImplIOS.h:
>+        * UIProcess/ios/PageClientImplIOS.mm:
>+        * UIProcess/ios/WKContentViewInteraction.h:
>+        * UIProcess/ios/WKContentViewInteraction.mm:
>+        (-[WKContentView _startDrag:item:]):
>+        (-[WKContentView _prepareToDragPromisedAttachment:]):
>+        (-[WKContentView _prepareToDragPromisedBlob:]): Deleted.
>+
>+        Reimplement the way promised attachment data is delivered to the destination when an attachment element is
>+        dragged. Instead of relying on the blob URL of the File on the attachment element, first try to find an API
>+        Attachment object corresponding to the unique identifier of the dragged attachment, and use its NSFileWrapper to
>+        deliver promised data to the destination file URL. The blob URL codepath still exists in the case where script
>+        specifies the dragged attachment's File.
>+
>+        * UIProcess/mac/PageClientImplMac.h:
>+        * UIProcess/mac/PageClientImplMac.mm:
>+        * WebProcess/WebCoreSupport/WebEditorClient.cpp:
>+        (WebKit::WebEditorClient::registerAttachmentIdentifier):
>+        (WebKit::WebEditorClient::cloneAttachmentData):
>+        * WebProcess/WebCoreSupport/WebEditorClient.h:
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::insertAttachment):
>+        (WebKit::WebPage::updateAttachmentAttributes):
>+        (WebKit::WebPage::requestAttachmentInfo): Deleted.
>+        (WebKit::WebPage::setAttachmentDataAndContentType): Deleted.
>+        * WebProcess/WebPage/WebPage.h:
>+        * WebProcess/WebPage/WebPage.messages.in:
>+
>+        More renaming and IPC message plumbing.
>+
> 2018-08-20  Carlos Garcia Campos  <cgarcia@igalia.com>
> 
>         Unreviewed. Fix GTK/WPE cookie API tests after r234396.
>diff --git a/Source/WebKitLegacy/win/ChangeLog b/Source/WebKitLegacy/win/ChangeLog
>index 2103f6e6c4d32258f7f11bb911e19613f0d8ba83..cf37b9faf0bd04dc1b25034958794f91a6264405 100644
>--- a/Source/WebKitLegacy/win/ChangeLog
>+++ b/Source/WebKitLegacy/win/ChangeLog
>@@ -1,3 +1,16 @@
>+2018-08-20  Wenson Hsieh  <wenson_hsieh@apple.com>
>+
>+        [Attachment Support] Augment _WKAttachment SPI to handle NSFileWrappers in addition to NSData
>+        https://bugs.webkit.org/show_bug.cgi?id=188496
>+        <rdar://problem/43216836>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Adjust for changing PromisedAttachmentInfo.h to forward declare WebCore::SharedBuffer rather than include the
>+        header directly.
>+
>+        * WebCoreSupport/WebDragClient.cpp:
>+
> 2018-08-17  Alex Christensen  <achristensen@webkit.org>
> 
>         Add some plumbing for safe browsing
>diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>index e996fed47c89810aeb8e9456221bc8d6ca450314..2252118f880b11f2f186937a62fe6f068e09b326 100644
>--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>@@ -4817,7 +4817,7 @@
> 		F478755419983AFF0024A287 /* ScrollSnapAnimatorState.h in Headers */ = {isa = PBXBuildFile; fileRef = F478755219983AFF0024A287 /* ScrollSnapAnimatorState.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		F47A09D120A93A9700240FAE /* DisabledAdaptations.h in Headers */ = {isa = PBXBuildFile; fileRef = F47A09CF20A939F600240FAE /* DisabledAdaptations.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		F47A5E3E195B8C8A00483100 /* StyleScrollSnapPoints.h in Headers */ = {isa = PBXBuildFile; fileRef = F47A5E3B195B8C8A00483100 /* StyleScrollSnapPoints.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		F47A633D1FF6FD500081B3CC /* PromisedBlobInfo.h in Headers */ = {isa = PBXBuildFile; fileRef = F47A633C1FF6FD500081B3CC /* PromisedBlobInfo.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		F47A633D1FF6FD500081B3CC /* PromisedAttachmentInfo.h in Headers */ = {isa = PBXBuildFile; fileRef = F47A633C1FF6FD500081B3CC /* PromisedAttachmentInfo.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		F48223101E3869B80066FC79 /* WebItemProviderPasteboard.mm in Sources */ = {isa = PBXBuildFile; fileRef = F482230E1E3869B80066FC79 /* WebItemProviderPasteboard.mm */; };
> 		F48223111E3869B80066FC79 /* WebItemProviderPasteboard.h in Headers */ = {isa = PBXBuildFile; fileRef = F482230F1E3869B80066FC79 /* WebItemProviderPasteboard.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		F48223131E386E240066FC79 /* AbstractPasteboard.h in Headers */ = {isa = PBXBuildFile; fileRef = F48223121E386E240066FC79 /* AbstractPasteboard.h */; settings = {ATTRIBUTES = (Private, ); }; };
>@@ -14566,7 +14566,7 @@
> 		F47A09D420A9DD0400240FAE /* DisabledAdaptations.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = DisabledAdaptations.cpp; sourceTree = "<group>"; };
> 		F47A5E3A195B8C8A00483100 /* StyleScrollSnapPoints.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = StyleScrollSnapPoints.cpp; sourceTree = "<group>"; };
> 		F47A5E3B195B8C8A00483100 /* StyleScrollSnapPoints.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = StyleScrollSnapPoints.h; sourceTree = "<group>"; };
>-		F47A633C1FF6FD500081B3CC /* PromisedBlobInfo.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PromisedBlobInfo.h; sourceTree = "<group>"; };
>+		F47A633C1FF6FD500081B3CC /* PromisedAttachmentInfo.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PromisedAttachmentInfo.h; sourceTree = "<group>"; };
> 		F482230E1E3869B80066FC79 /* WebItemProviderPasteboard.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WebItemProviderPasteboard.mm; sourceTree = "<group>"; };
> 		F482230F1E3869B80066FC79 /* WebItemProviderPasteboard.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebItemProviderPasteboard.h; sourceTree = "<group>"; };
> 		F48223121E386E240066FC79 /* AbstractPasteboard.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AbstractPasteboard.h; sourceTree = "<group>"; };
>@@ -24602,7 +24602,7 @@
> 				BC3BE12A0E98092F00835588 /* PopupMenuStyle.h */,
> 				51F645D21FECDBC800B54DED /* Process.cpp */,
> 				51F645D31FECDBC800B54DED /* Process.h */,
>-				F47A633C1FF6FD500081B3CC /* PromisedBlobInfo.h */,
>+				F47A633C1FF6FD500081B3CC /* PromisedAttachmentInfo.h */,
> 				0081FEFD16B0A244008AAA7A /* PublicSuffix.h */,
> 				5C97A3361F5F7A6500105207 /* RectEdges.h */,
> 				CA1635DC2072E76900E7D2CE /* ReferrerPolicy.cpp */,
>@@ -29850,7 +29850,7 @@
> 				A715E653134BBBEC00D8E713 /* ProgressShadowElement.h in Headers */,
> 				1A2A68240B5BEDE70002A480 /* ProgressTracker.h in Headers */,
> 				1ACADD791880D91C00D8B71D /* ProgressTrackerClient.h in Headers */,
>-				F47A633D1FF6FD500081B3CC /* PromisedBlobInfo.h in Headers */,
>+				F47A633D1FF6FD500081B3CC /* PromisedAttachmentInfo.h in Headers */,
> 				A578F4351DE00EEB003DFC6A /* PromiseRejectionEvent.h in Headers */,
> 				E4BBED0F14F4025D003F0B98 /* PropertySetCSSStyleDeclaration.h in Headers */,
> 				37BAAE581980D1DD005DFE71 /* ProtectionSpace.h in Headers */,
>diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
>index 39b5342858a57e455f2cea8892dbdabf2842cdb3..da1acf54936f6664d526f9350218e34b529b9e71 100644
>--- a/Source/WebCore/dom/Document.cpp
>+++ b/Source/WebCore/dom/Document.cpp
>@@ -7944,15 +7944,21 @@ Vector<RefPtr<WebAnimation>> Document::getAnimations()
> void Document::didInsertAttachmentElement(HTMLAttachmentElement& attachment)
> {
>     auto identifier = attachment.uniqueIdentifier();
>-    if (identifier.isEmpty() || m_attachmentIdentifierToElementMap.contains(identifier)) {
>+    auto previousIdentifier = identifier;
>+    bool previousIdentifierIsNotUnique = !previousIdentifier.isEmpty() && m_attachmentIdentifierToElementMap.contains(previousIdentifier);
>+    if (identifier.isEmpty() || previousIdentifierIsNotUnique) {
>+        previousIdentifier = identifier;
>         identifier = createCanonicalUUIDString();
>         attachment.setUniqueIdentifier(identifier);
>     }
> 
>     m_attachmentIdentifierToElementMap.set(identifier, attachment);
> 
>-    if (frame())
>-        frame()->editor().didInsertAttachmentElement(attachment);
>+    if (auto* frame = this->frame()) {
>+        if (previousIdentifierIsNotUnique)
>+            frame->editor().cloneAttachmentData(previousIdentifier, identifier);
>+        frame->editor().didInsertAttachmentElement(attachment);
>+    }
> }
> 
> void Document::didRemoveAttachmentElement(HTMLAttachmentElement& attachment)
>diff --git a/Source/WebCore/editing/Editor.cpp b/Source/WebCore/editing/Editor.cpp
>index 1b20d78199c0b17d674dce0e851f37b65eab326a..c4a2f7b165435a63b9d4ed6fc396f1301f60eaa2 100644
>--- a/Source/WebCore/editing/Editor.cpp
>+++ b/Source/WebCore/editing/Editor.cpp
>@@ -3817,6 +3817,24 @@ void Editor::scheduleEditorUIUpdate()
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
> 
>+void Editor::registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& preferredFileName, Ref<SharedBuffer>&& data)
>+{
>+    if (auto* client = this->client())
>+        client->registerAttachmentIdentifier(identifier, contentType, preferredFileName, WTFMove(data));
>+}
>+
>+void Editor::registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& filePath)
>+{
>+    if (auto* client = this->client())
>+        client->registerAttachmentIdentifier(identifier, contentType, filePath);
>+}
>+
>+void Editor::cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier)
>+{
>+    if (auto* client = this->client())
>+        client->cloneAttachmentData(fromIdentifier, toIdentifier);
>+}
>+
> void Editor::didInsertAttachmentElement(HTMLAttachmentElement& attachment)
> {
>     auto identifier = attachment.uniqueIdentifier();
>@@ -3861,28 +3879,11 @@ void Editor::notifyClientOfAttachmentUpdates()
>     }
> }
> 
>-void Editor::insertAttachment(const String& identifier, const AttachmentDisplayOptions& options, const String& filename, const String& filepath, std::optional<String> contentType)
>-{
>-    if (!contentType)
>-        contentType = File::contentTypeForFile(filename);
>-    insertAttachmentFromFile(identifier, options, filename, *contentType, File::create(filepath));
>-}
>-
>-void Editor::insertAttachment(const String& identifier, const AttachmentDisplayOptions& options, const String& filename, Ref<SharedBuffer>&& data, std::optional<String> contentType)
>-{
>-    if (!contentType)
>-        contentType = File::contentTypeForFile(filename);
>-    insertAttachmentFromFile(identifier, options, filename, *contentType, File::create(Blob::create(WTFMove(data), *contentType), filename));
>-}
>-
>-void Editor::insertAttachmentFromFile(const String& identifier, const AttachmentDisplayOptions&, const String& filename, const String& contentType, Ref<File>&& file)
>+void Editor::insertAttachment(const String& identifier, const AttachmentDisplayOptions&, uint64_t fileSize, const String& fileName, std::optional<String>&& explicitContentType)
> {
>     auto attachment = HTMLAttachmentElement::create(HTMLNames::attachmentTag, document());
>-    attachment->setAttribute(HTMLNames::titleAttr, filename);
>-    attachment->setAttribute(HTMLNames::subtitleAttr, fileSizeDescription(file->size()));
>-    attachment->setAttribute(HTMLNames::typeAttr, contentType);
>     attachment->setUniqueIdentifier(identifier);
>-    attachment->setFile(WTFMove(file));
>+    attachment->updateAttributes(fileSize, WTFMove(explicitContentType), fileName);
> 
>     auto fragmentToInsert = document().createDocumentFragment();
>     fragmentToInsert->appendChild(attachment.get());
>diff --git a/Source/WebCore/editing/Editor.h b/Source/WebCore/editing/Editor.h
>index 8ad78820b2251fdd0cfe6e3e34b03903bc841b32..e2bcc91a8d3635316ee6a2d440a65a0c949d6e75 100644
>--- a/Source/WebCore/editing/Editor.h
>+++ b/Source/WebCore/editing/Editor.h
>@@ -503,8 +503,10 @@ public:
>     bool isGettingDictionaryPopupInfo() const { return m_isGettingDictionaryPopupInfo; }
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>-    WEBCORE_EXPORT void insertAttachment(const String& identifier, const AttachmentDisplayOptions&, const String& filename, const String& filepath, std::optional<String> contentType = std::nullopt);
>-    WEBCORE_EXPORT void insertAttachment(const String& identifier, const AttachmentDisplayOptions&, const String& filename, Ref<SharedBuffer>&& data, std::optional<String> contentType = std::nullopt);
>+    WEBCORE_EXPORT void insertAttachment(const String& identifier, const AttachmentDisplayOptions&, uint64_t fileSize, const String& fileName, std::optional<String>&& explicitContentType = std::nullopt);
>+    void registerAttachmentIdentifier(const String&, const String& /* contentType */, const String& /* preferredFileName */, Ref<SharedBuffer>&&);
>+    void registerAttachmentIdentifier(const String&, const String& /* contentType */, const String& /* filePath */);
>+    void cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier);
>     void didInsertAttachmentElement(HTMLAttachmentElement&);
>     void didRemoveAttachmentElement(HTMLAttachmentElement&);
> 
>@@ -516,10 +518,6 @@ public:
> private:
>     Document& document() const;
> 
>-#if ENABLE(ATTACHMENT_ELEMENT)
>-    void insertAttachmentFromFile(const String& identifier, const AttachmentDisplayOptions&, const String& filename, const String& contentType, Ref<File>&&);
>-#endif
>-
>     bool canDeleteRange(Range*) const;
>     bool canSmartReplaceWithPasteboard(Pasteboard&);
>     void pasteAsPlainTextWithPasteboard(Pasteboard&);
>diff --git a/Source/WebCore/editing/cocoa/WebContentReaderCocoa.mm b/Source/WebCore/editing/cocoa/WebContentReaderCocoa.mm
>index 1cb2b1ce6adca4656117cda274b0811d3188b459..b0cb79627838c226f15f727c4d9da0e7a0797587 100644
>--- a/Source/WebCore/editing/cocoa/WebContentReaderCocoa.mm
>+++ b/Source/WebCore/editing/cocoa/WebContentReaderCocoa.mm
>@@ -35,6 +35,7 @@
> #import "DocumentFragment.h"
> #import "DocumentLoader.h"
> #import "File.h"
>+#import "FileSystem.h"
> #import "Frame.h"
> #import "FrameLoader.h"
> #import "FrameLoaderClient.h"
>@@ -204,11 +205,30 @@ static bool shouldReplaceRichContentWithAttachments()
> #endif
> }
> 
>-static Ref<DocumentFragment> createFragmentForImageAttachment(Document& document, Ref<Blob>&& blob)
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+
>+static bool supportsClientSideAttachmentData(const Frame& frame)
>+{
>+    if (auto* client = frame.editor().client())
>+        return client->supportsClientSideAttachmentData();
>+
>+    return false;
>+}
>+
>+#endif
>+
>+static Ref<DocumentFragment> createFragmentForImageAttachment(Frame& frame, Document& document, Ref<SharedBuffer>&& buffer, const String& contentType)
> {
> #if ENABLE(ATTACHMENT_ELEMENT)
>     auto attachment = HTMLAttachmentElement::create(HTMLNames::attachmentTag, document);
>-    attachment->setFile(File::create(blob, AtomicString("image")), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
>+    // FIXME: This fallback image name needs to be a localized string.
>+    String defaultImageAttachmentName { "image"_s };
>+
>+    if (supportsClientSideAttachmentData(frame)) {
>+        attachment->updateAttributes(buffer->size(), contentType, defaultImageAttachmentName);
>+        frame.editor().registerAttachmentIdentifier(attachment->ensureUniqueIdentifier(), contentType, defaultImageAttachmentName, WTFMove(buffer));
>+    } else
>+        attachment->setFile(File::create(Blob::create(buffer.get(), contentType), defaultImageAttachmentName), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
> 
>     auto fragment = document.createDocumentFragment();
>     fragment->appendChild(attachment);
>@@ -220,11 +240,13 @@ static Ref<DocumentFragment> createFragmentForImageAttachment(Document& document
> #endif
> }
> 
>-static void replaceRichContentWithAttachments(DocumentFragment& fragment, const Vector<Ref<ArchiveResource>>& subresources)
>+static void replaceRichContentWithAttachments(Frame& frame, DocumentFragment& fragment, const Vector<Ref<ArchiveResource>>& subresources)
> {
> #if ENABLE(ATTACHMENT_ELEMENT)
>     struct AttachmentReplacementInfo {
>-        Ref<File> file;
>+        String fileName;
>+        String contentType;
>+        Ref<SharedBuffer> data;
>         Ref<Element> elementToReplace;
>     };
> 
>@@ -233,11 +255,11 @@ static void replaceRichContentWithAttachments(DocumentFragment& fragment, const
>         return;
> 
>     // FIXME: Handle resources in subframe archives.
>-    HashMap<AtomicString, Ref<Blob>> urlToBlobMap;
>-    for (const Ref<ArchiveResource>& subresource : subresources) {
>+    HashMap<AtomicString, Ref<ArchiveResource>> urlToResourceMap;
>+    for (auto& subresource : subresources) {
>         auto& url = subresource->url();
>         if (shouldReplaceSubresourceURL(url))
>-            urlToBlobMap.set(url.string(), Blob::create(subresource->data(), subresource->mimeType()));
>+            urlToResourceMap.set(url.string(), subresource.copyRef());
>     }
> 
>     Vector<Ref<Element>> elementsToRemove;
>@@ -247,15 +269,15 @@ static void replaceRichContentWithAttachments(DocumentFragment& fragment, const
>         if (resourceURLString.isEmpty())
>             continue;
> 
>-        auto blob = urlToBlobMap.get(resourceURLString);
>-        if (!blob)
>+        auto resource = urlToResourceMap.find(resourceURLString);
>+        if (resource == urlToResourceMap.end())
>             continue;
> 
>-        auto title = URLParser { resourceURLString }.result().lastPathComponent();
>-        if (title.isEmpty())
>-            title = AtomicString("media");
>+        auto name = URLParser { resourceURLString }.result().lastPathComponent();
>+        if (name.isEmpty())
>+            name = AtomicString("media");
> 
>-        attachmentReplacementInfo.append({ File::create(*blob, title), image });
>+        attachmentReplacementInfo.append({ name, resource->value->mimeType(), resource->value->data(), image });
>     }
> 
>     for (auto& object : descendantsOfType<HTMLObjectElement>(fragment)) {
>@@ -265,28 +287,30 @@ static void replaceRichContentWithAttachments(DocumentFragment& fragment, const
>             continue;
>         }
> 
>-        auto blob = urlToBlobMap.get(resourceURLString);
>-        if (!blob) {
>-            elementsToRemove.append(object);
>+        auto resource = urlToResourceMap.find(resourceURLString);
>+        if (resource == urlToResourceMap.end())
>             continue;
>-        }
> 
>-        auto title = URLParser { resourceURLString }.result().lastPathComponent();
>-        if (title.isEmpty())
>-            title = AtomicString("file");
>+        auto name = URLParser { resourceURLString }.result().lastPathComponent();
>+        if (name.isEmpty())
>+            name = AtomicString("file");
> 
>-        attachmentReplacementInfo.append({ File::create(*blob, title), object });
>+        attachmentReplacementInfo.append({ name, resource->value->mimeType(), resource->value->data(), object });
>     }
> 
>     for (auto& info : attachmentReplacementInfo) {
>-        auto file = WTFMove(info.file);
>         auto elementToReplace = WTFMove(info.elementToReplace);
>         auto parent = makeRefPtr(elementToReplace->parentNode());
>         if (!parent)
>             continue;
> 
>         auto attachment = HTMLAttachmentElement::create(HTMLNames::attachmentTag, fragment.document());
>-        attachment->setFile(WTFMove(file), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
>+        if (supportsClientSideAttachmentData(frame)) {
>+            attachment->updateAttributes(info.data->size(), info.contentType, info.fileName);
>+            frame.editor().registerAttachmentIdentifier(attachment->ensureUniqueIdentifier(), WTFMove(info.contentType), WTFMove(info.fileName), WTFMove(info.data));
>+        } else
>+            attachment->setFile(File::create(Blob::create(info.data, info.contentType), info.fileName), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
>+
>         parent->replaceChild(attachment, elementToReplace);
>     }
> 
>@@ -349,7 +373,7 @@ RefPtr<DocumentFragment> createFragmentAndAddResources(Frame& frame, NSAttribute
>     replaceSubresourceURLsWithURLsFromClient(*fragmentAndResources.fragment, fragmentAndResources.resources, unreplacedResources);
> 
>     if (shouldReplaceRichContentWithAttachments()) {
>-        replaceRichContentWithAttachments(*fragmentAndResources.fragment, unreplacedResources);
>+        replaceRichContentWithAttachments(frame, *fragmentAndResources.fragment, unreplacedResources);
>         return WTFMove(fragmentAndResources.fragment);
>     }
> 
>@@ -387,7 +411,7 @@ static std::optional<MarkupAndArchive> extractMarkupAndArchive(SharedBuffer& buf
>     return MarkupAndArchive { String::fromUTF8(mainResource->data().data(), mainResource->data().size()), mainResource.releaseNonNull(), archive.releaseNonNull() };
> }
> 
>-static String sanitizeMarkupWithArchive(Document& destinationDocument, MarkupAndArchive& markupAndArchive, MSOListQuirks msoListQuirks, const std::function<bool(const String)>& canShowMIMETypeAsHTML)
>+static String sanitizeMarkupWithArchive(Frame& frame, Document& destinationDocument, MarkupAndArchive& markupAndArchive, MSOListQuirks msoListQuirks, const std::function<bool(const String)>& canShowMIMETypeAsHTML)
> {
>     auto page = createPageForSanitizingWebContent();
>     Document* stagingDocument = page->mainFrame().document();
>@@ -398,7 +422,7 @@ static String sanitizeMarkupWithArchive(Document& destinationDocument, MarkupAnd
>     replaceSubresourceURLsWithURLsFromClient(fragment, markupAndArchive.archive->subresources(), unreplacedResources);
> 
>     if (shouldReplaceRichContentWithAttachments()) {
>-        replaceRichContentWithAttachments(fragment, unreplacedResources);
>+        replaceRichContentWithAttachments(frame, fragment, unreplacedResources);
>         return sanitizedMarkupForFragmentInDocument(WTFMove(fragment), *stagingDocument, msoListQuirks, markupAndArchive.markup);
>     }
> 
>@@ -428,7 +452,7 @@ static String sanitizeMarkupWithArchive(Document& destinationDocument, MarkupAnd
> 
>         MarkupAndArchive subframeContent = { String::fromUTF8(subframeMainResource->data().data(), subframeMainResource->data().size()),
>             subframeMainResource.releaseNonNull(), subframeArchive.copyRef() };
>-        auto subframeMarkup = sanitizeMarkupWithArchive(destinationDocument, subframeContent, MSOListQuirks::Disabled, canShowMIMETypeAsHTML);
>+        auto subframeMarkup = sanitizeMarkupWithArchive(frame, destinationDocument, subframeContent, MSOListQuirks::Disabled, canShowMIMETypeAsHTML);
> 
>         CString utf8 = subframeMarkup.utf8();
>         Vector<uint8_t> blobBuffer;
>@@ -469,7 +493,7 @@ bool WebContentReader::readWebArchive(SharedBuffer& buffer)
>         return true;
>     }
> 
>-    String sanitizedMarkup = sanitizeMarkupWithArchive(*frame.document(), *result, msoListQuirksForMarkup(), [&] (const String& type) {
>+    String sanitizedMarkup = sanitizeMarkupWithArchive(frame, *frame.document(), *result, msoListQuirksForMarkup(), [&] (const String& type) {
>         return frame.loader().client().canShowMIMETypeAsHTML(type);
>     });
>     fragment = createFragmentFromMarkup(*frame.document(), sanitizedMarkup, blankURL(), DisallowScriptingAndPluginContent);
>@@ -496,7 +520,7 @@ bool WebContentMarkupReader::readWebArchive(SharedBuffer& buffer)
>         return true;
>     }
> 
>-    markup = sanitizeMarkupWithArchive(*frame.document(), *result, msoListQuirksForMarkup(), [&] (const String& type) {
>+    markup = sanitizeMarkupWithArchive(frame, *frame.document(), *result, msoListQuirksForMarkup(), [&] (const String& type) {
>         return frame.loader().client().canShowMIMETypeAsHTML(type);
>     });
> 
>@@ -635,11 +659,10 @@ bool WebContentReader::readImage(Ref<SharedBuffer>&& buffer, const String& type)
>         return true;
>     }
> 
>-    auto blob = Blob::create(buffer.get(), type);
>     if (shouldReplaceRichContentWithAttachments())
>-        addFragment(createFragmentForImageAttachment(document, WTFMove(blob)));
>+        addFragment(createFragmentForImageAttachment(frame, document, WTFMove(buffer), type));
>     else
>-        addFragment(createFragmentForImageAndURL(document, DOMURL::createObjectURL(document, blob)));
>+        addFragment(createFragmentForImageAndURL(document, DOMURL::createObjectURL(document, Blob::create(buffer.get(), type))));
> 
>     return fragment;
> }
>@@ -657,7 +680,15 @@ bool WebContentReader::readFilePaths(const Vector<String>& paths)
>     if (RuntimeEnabledFeatures::sharedFeatures().attachmentElementEnabled()) {
>         for (auto& path : paths) {
>             auto attachment = HTMLAttachmentElement::create(HTMLNames::attachmentTag, document);
>-            attachment->setFile(File::create(path), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
>+            if (supportsClientSideAttachmentData(frame)) {
>+                long long fileSize { 0 };
>+                FileSystem::getFileSize(path, fileSize);
>+                auto contentType = File::contentTypeForFile(path);
>+                attachment->updateAttributes(fileSize, contentType, FileSystem::pathGetFileName(path));
>+                frame.editor().registerAttachmentIdentifier(attachment->ensureUniqueIdentifier(), contentType, path);
>+            } else
>+                attachment->setFile(File::create(path), HTMLAttachmentElement::UpdateDisplayAttributes::Yes);
>+
>             fragment->appendChild(attachment);
>         }
>     }
>diff --git a/Source/WebCore/html/AttachmentTypes.h b/Source/WebCore/html/AttachmentTypes.h
>index b5077ca4082217550e1bf5cb74285cc4a43ee6cc..89bbcabae8f3412a7ee592bd66b09ae88ce24304 100644
>--- a/Source/WebCore/html/AttachmentTypes.h
>+++ b/Source/WebCore/html/AttachmentTypes.h
>@@ -32,8 +32,6 @@
> 
> namespace WebCore {
> 
>-class SharedBuffer;
>-
> struct AttachmentDisplayOptions {
>     template<class Encoder> void encode(Encoder&) const;
>     template<class Decoder> static std::optional<AttachmentDisplayOptions> decode(Decoder&);
>@@ -50,13 +48,6 @@ template<class Decoder> inline std::optional<AttachmentDisplayOptions> Attachmen
>     return AttachmentDisplayOptions();
> }
> 
>-struct AttachmentInfo {
>-    String contentType;
>-    String name;
>-    String filePath;
>-    RefPtr<SharedBuffer> data;
>-};
>-
> } // namespace WebCore
> 
> #endif // ENABLE(ATTACHMENT_ELEMENT)
>diff --git a/Source/WebCore/html/HTMLAttachmentElement.cpp b/Source/WebCore/html/HTMLAttachmentElement.cpp
>index e1719cd11f666035bd804db3b97b2f336a00f306..405cb3eb9e217be39265733bec7c5b6082a9eda1 100644
>--- a/Source/WebCore/html/HTMLAttachmentElement.cpp
>+++ b/Source/WebCore/html/HTMLAttachmentElement.cpp
>@@ -32,14 +32,13 @@
> #include "Document.h"
> #include "Editor.h"
> #include "File.h"
>-#include "FileReaderLoader.h"
>-#include "FileReaderLoaderClient.h"
> #include "Frame.h"
> #include "HTMLNames.h"
> #include "RenderAttachment.h"
> #include "SharedBuffer.h"
> #include <pal/FileSizeFormatter.h>
> #include <wtf/IsoMallocInlines.h>
>+#include <wtf/UUID.h>
> 
> namespace WebCore {
> 
>@@ -47,36 +46,6 @@ WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLAttachmentElement);
> 
> using namespace HTMLNames;
> 
>-class AttachmentDataReader : public FileReaderLoaderClient {
>-public:
>-    static std::unique_ptr<AttachmentDataReader> create(HTMLAttachmentElement& attachment, Function<void(RefPtr<SharedBuffer>&&)>&& callback)
>-    {
>-        return std::make_unique<AttachmentDataReader>(attachment, WTFMove(callback));
>-    }
>-
>-    AttachmentDataReader(HTMLAttachmentElement& attachment, Function<void(RefPtr<SharedBuffer>&&)>&& callback)
>-        : m_attachment(attachment)
>-        , m_callback(std::make_unique<Function<void(RefPtr<SharedBuffer>&&)>>(WTFMove(callback)))
>-        , m_loader(std::make_unique<FileReaderLoader>(FileReaderLoader::ReadType::ReadAsArrayBuffer, this))
>-    {
>-        m_loader->start(&attachment.document(), *attachment.file());
>-    }
>-
>-    ~AttachmentDataReader();
>-
>-private:
>-    void didStartLoading() final { }
>-    void didReceiveData() final { }
>-    void didFinishLoading() final;
>-    void didFail(int error) final;
>-
>-    void invokeCallbackAndFinishReading(RefPtr<SharedBuffer>&&);
>-
>-    HTMLAttachmentElement& m_attachment;
>-    std::unique_ptr<Function<void(RefPtr<SharedBuffer>&&)>> m_callback;
>-    std::unique_ptr<FileReaderLoader> m_loader;
>-};
>-
> HTMLAttachmentElement::HTMLAttachmentElement(const QualifiedName& tagName, Document& document)
>     : HTMLElement(tagName, document)
> {
>@@ -140,6 +109,13 @@ void HTMLAttachmentElement::removedFromAncestor(RemovalType type, ContainerNode&
>         document().didRemoveAttachmentElement(*this);
> }
> 
>+String HTMLAttachmentElement::ensureUniqueIdentifier()
>+{
>+    if (m_uniqueIdentifier.isEmpty())
>+        m_uniqueIdentifier = createCanonicalUUIDString();
>+    return m_uniqueIdentifier;
>+}
>+
> void HTMLAttachmentElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
> {
>     if (name == progressAttr || name == subtitleAttr || name == titleAttr || name == typeAttr) {
>@@ -168,68 +144,17 @@ String HTMLAttachmentElement::attachmentPath() const
>     return attributeWithoutSynchronization(webkitattachmentpathAttr);
> }
> 
>-void HTMLAttachmentElement::updateFileWithData(Ref<SharedBuffer>&& data, std::optional<String>&& newContentType, std::optional<String>&& newFilename)
>-{
>-    auto filename = newFilename ? *newFilename : attachmentTitle();
>-    auto contentType = newContentType ? *newContentType : File::contentTypeForFile(filename);
>-    auto file = File::create(Blob::create(WTFMove(data), contentType), filename);
>-    setFile(WTFMove(file), UpdateDisplayAttributes::Yes);
>-}
>-
>-void HTMLAttachmentElement::requestInfo(Function<void(const AttachmentInfo&)>&& callback)
>-{
>-    if (!m_file) {
>-        callback({ });
>-        return;
>-    }
>-
>-    AttachmentInfo infoWithoutData { m_file->type(), m_file->name(), m_file->path(), nullptr };
>-    if (!m_file->path().isEmpty()) {
>-        callback(infoWithoutData);
>-        return;
>-    }
>-
>-    m_attachmentReaders.append(AttachmentDataReader::create(*this, [infoWithoutData = WTFMove(infoWithoutData), protectedFile = makeRef(*m_file), callback = WTFMove(callback)] (RefPtr<SharedBuffer>&& data) {
>-        callback({ infoWithoutData.contentType, infoWithoutData.name, infoWithoutData.filePath, WTFMove(data) });
>-    }));
>-}
>-
>-void HTMLAttachmentElement::destroyReader(AttachmentDataReader& finishedReader)
>+void HTMLAttachmentElement::updateAttributes(uint64_t fileSize, std::optional<String>&& newContentType, std::optional<String>&& newFilename)
> {
>-    m_attachmentReaders.removeFirstMatching([&] (const std::unique_ptr<AttachmentDataReader>& reader) -> bool {
>-        return reader.get() == &finishedReader;
>-    });
>-}
>+    if (newFilename)
>+        setAttributeWithoutSynchronization(HTMLNames::titleAttr, *newFilename);
> 
>-AttachmentDataReader::~AttachmentDataReader()
>-{
>-    invokeCallbackAndFinishReading(nullptr);
>-}
>+    if (newContentType)
>+        setAttributeWithoutSynchronization(HTMLNames::typeAttr, *newContentType);
> 
>-void AttachmentDataReader::didFinishLoading()
>-{
>-    if (auto arrayBuffer = m_loader->arrayBufferResult())
>-        invokeCallbackAndFinishReading(SharedBuffer::create(reinterpret_cast<uint8_t*>(arrayBuffer->data()), arrayBuffer->byteLength()));
>-    else
>-        invokeCallbackAndFinishReading(nullptr);
>-    m_attachment.destroyReader(*this);
>-}
>-
>-void AttachmentDataReader::didFail(int)
>-{
>-    invokeCallbackAndFinishReading(nullptr);
>-    m_attachment.destroyReader(*this);
>-}
>-
>-void AttachmentDataReader::invokeCallbackAndFinishReading(RefPtr<SharedBuffer>&& data)
>-{
>-    auto callback = WTFMove(m_callback);
>-    if (!callback)
>-        return;
>-
>-    m_loader->cancel();
>-    m_loader = nullptr;
>-    (*callback)(WTFMove(data));
>+    setAttributeWithoutSynchronization(HTMLNames::subtitleAttr, fileSizeDescription(fileSize));
>+    if (auto* renderer = this->renderer())
>+        renderer->invalidate();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/HTMLAttachmentElement.h b/Source/WebCore/html/HTMLAttachmentElement.h
>index 14fc84bd9a5790160d0b87af33fd9849c4c9a93f..db806ac991a8fa345b6ae8cbbb48260e0f1e8697 100644
>--- a/Source/WebCore/html/HTMLAttachmentElement.h
>+++ b/Source/WebCore/html/HTMLAttachmentElement.h
>@@ -32,12 +32,8 @@
> 
> namespace WebCore {
> 
>-class AttachmentDataReader;
> class File;
>-class HTMLImageElement;
>-class HTMLVideoElement;
> class RenderAttachment;
>-class SharedBuffer;
> 
> class HTMLAttachmentElement final : public HTMLElement {
>     WTF_MAKE_ISO_ALLOCATED(HTMLAttachmentElement);
>@@ -53,20 +49,19 @@ public:
>     String uniqueIdentifier() const { return m_uniqueIdentifier; }
>     void setUniqueIdentifier(const String& uniqueIdentifier) { m_uniqueIdentifier = uniqueIdentifier; }
> 
>-    WEBCORE_EXPORT void updateFileWithData(Ref<SharedBuffer>&& data, std::optional<String>&& newContentType = std::nullopt, std::optional<String>&& newFilename = std::nullopt);
>+    WEBCORE_EXPORT void updateAttributes(uint64_t fileSize, std::optional<String>&& newContentType = std::nullopt, std::optional<String>&& newFilename = std::nullopt);
> 
>     InsertedIntoAncestorResult insertedIntoAncestor(InsertionType, ContainerNode&) final;
>     void removedFromAncestor(RemovalType, ContainerNode&) final;
> 
>+    String ensureUniqueIdentifier();
>+
>     WEBCORE_EXPORT String attachmentTitle() const;
>     String attachmentType() const;
>     String attachmentPath() const;
> 
>     RenderAttachment* renderer() const;
> 
>-    WEBCORE_EXPORT void requestInfo(Function<void(const AttachmentInfo&)>&& callback);
>-    void destroyReader(AttachmentDataReader&);
>-
> private:
>     HTMLAttachmentElement(const QualifiedName&, Document&);
>     virtual ~HTMLAttachmentElement();
>@@ -83,7 +78,6 @@ private:
>     void parseAttribute(const QualifiedName&, const AtomicString&) final;
>     
>     RefPtr<File> m_file;
>-    Vector<std::unique_ptr<AttachmentDataReader>> m_attachmentReaders;
>     String m_uniqueIdentifier;
> };
> 
>diff --git a/Source/WebCore/page/DragClient.h b/Source/WebCore/page/DragClient.h
>index b74485d07ebe781ed4b67463b05c8061445464b3..37860680996e39cae3883db487703e8e4a27673e 100644
>--- a/Source/WebCore/page/DragClient.h
>+++ b/Source/WebCore/page/DragClient.h
>@@ -37,7 +37,7 @@ class DataTransfer;
> class Element;
> class Frame;
> class Image;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> 
> class DragClient {
> public:
>diff --git a/Source/WebCore/page/DragController.cpp b/Source/WebCore/page/DragController.cpp
>index 9f9bc324245ff904890d5d6f22377773757b7b91..d50e118b1de9231df791515c8d8ffad4b10e3b1e 100644
>--- a/Source/WebCore/page/DragController.cpp
>+++ b/Source/WebCore/page/DragController.cpp
>@@ -69,7 +69,7 @@
> #include "PluginDocument.h"
> #include "PluginViewBase.h"
> #include "Position.h"
>-#include "PromisedBlobInfo.h"
>+#include "PromisedAttachmentInfo.h"
> #include "RenderAttachment.h"
> #include "RenderFileUploadControl.h"
> #include "RenderImage.h"
>@@ -1136,11 +1136,11 @@ bool DragController::startDrag(Frame& src, const DragState& state, DragOperation
>         auto previousSelection = src.selection().selection();
>         selectElement(element);
> 
>-        PromisedBlobInfo promisedBlob;
>+        PromisedAttachmentInfo promisedAttachment;
>         if (hasData == HasNonDefaultPasteboardData::No) {
>-            promisedBlob = promisedBlobInfo(src, attachment);
>+            promisedAttachment = promisedAttachmentInfo(src, attachment);
>             auto& editor = src.editor();
>-            if (!promisedBlob && editor.client()) {
>+            if (!promisedAttachment && editor.client()) {
> #if PLATFORM(COCOA)
>                 // Otherwise, if no file URL is specified, call out to the injected bundle to populate the pasteboard with data.
>                 editor.willWriteSelectionToPasteboard(src.selection().toNormalizedRange().get());
>@@ -1164,7 +1164,7 @@ bool DragController::startDrag(Frame& src, const DragState& state, DragOperation
>             dragLoc = dragLocForSelectionDrag(src);
>             m_dragOffset = IntPoint(dragOrigin.x() - dragLoc.x(), dragOrigin.y() - dragLoc.y());
>         }
>-        doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, WTFMove(promisedBlob));
>+        doSystemDrag(WTFMove(dragImage), dragLoc, dragOrigin, src, state, WTFMove(promisedAttachment));
>         if (!element.isContentRichlyEditable())
>             src.selection().setSelection(previousSelection);
>         src.editor().setIgnoreSelectionChanges(false);
>@@ -1270,7 +1270,7 @@ void DragController::beginDrag(DragItem dragItem, Frame& frame, const IntPoint&
>     cleanupAfterSystemDrag();
> }
> 
>-void DragController::doSystemDrag(DragImage image, const IntPoint& dragLoc, const IntPoint& eventPos, Frame& frame, const DragState& state, PromisedBlobInfo&& promisedBlob)
>+void DragController::doSystemDrag(DragImage image, const IntPoint& dragLoc, const IntPoint& eventPos, Frame& frame, const DragState& state, PromisedAttachmentInfo&& promisedAttachmentInfo)
> {
>     m_didInitiateDrag = true;
>     m_dragInitiator = frame.document();
>@@ -1281,7 +1281,7 @@ void DragController::doSystemDrag(DragImage image, const IntPoint& dragLoc, cons
>     DragItem item;
>     item.image = WTFMove(image);
>     item.sourceAction = state.type;
>-    item.promisedBlob = WTFMove(promisedBlob);
>+    item.promisedAttachmentInfo = WTFMove(promisedAttachmentInfo);
> 
>     auto eventPositionInRootViewCoordinates = frame.view()->contentsToRootView(eventPos);
>     auto dragLocationInRootViewCoordinates = frame.view()->contentsToRootView(dragLoc);
>@@ -1367,11 +1367,8 @@ String DragController::platformContentTypeForBlobType(const String& type) const
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
> 
>-PromisedBlobInfo DragController::promisedBlobInfo(Frame& frame, HTMLAttachmentElement& attachment)
>+PromisedAttachmentInfo DragController::promisedAttachmentInfo(Frame& frame, HTMLAttachmentElement& attachment)
> {
>-    if (!attachment.file())
>-        return { };
>-
>     Vector<String> additionalTypes;
>     Vector<RefPtr<SharedBuffer>> additionalData;
> #if PLATFORM(COCOA)
>@@ -1379,8 +1376,10 @@ PromisedBlobInfo DragController::promisedBlobInfo(Frame& frame, HTMLAttachmentEl
>         frame.editor().getPasteboardTypesAndDataForAttachment(attachment, additionalTypes, additionalData);
> #endif
> 
>-    auto& file = *attachment.file();
>-    return { file.url(), platformContentTypeForBlobType(file.type()), file.name(), WTFMove(additionalTypes), WTFMove(additionalData) };
>+    if (auto* file = attachment.file())
>+        return { file->url(), platformContentTypeForBlobType(file->type()), file->name(), attachment.uniqueIdentifier(), WTFMove(additionalTypes), WTFMove(additionalData) };
>+
>+    return { { }, platformContentTypeForBlobType(attachment.attachmentType()), attachment.attachmentTitle(), attachment.uniqueIdentifier(), WTFMove(additionalTypes), WTFMove(additionalData) };
> }
> 
> #endif // ENABLE(ATTACHMENT_ELEMENT)
>diff --git a/Source/WebCore/page/DragController.h b/Source/WebCore/page/DragController.h
>index 83e575da72350add867003cfd9ed596d88d923ff..22a69583aadb66e9bdf27103a35a2d8470d8ba53 100644
>--- a/Source/WebCore/page/DragController.h
>+++ b/Source/WebCore/page/DragController.h
>@@ -48,7 +48,7 @@ class PlatformMouseEvent;
> 
> struct DragItem;
> struct DragState;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> 
>     class DragController {
>         WTF_MAKE_NONCOPYABLE(DragController); WTF_MAKE_FAST_ALLOCATED;
>@@ -116,7 +116,7 @@ struct PromisedBlobInfo;
>         bool shouldUseCachedImageForDragImage(const Image&) const;
> 
>         void doImageDrag(Element&, const IntPoint&, const IntRect&, Frame&, IntPoint&, const DragState&);
>-        void doSystemDrag(DragImage, const IntPoint&, const IntPoint&, Frame&, const DragState&, PromisedBlobInfo&&);
>+        void doSystemDrag(DragImage, const IntPoint&, const IntPoint&, Frame&, const DragState&, PromisedAttachmentInfo&&);
> 
>         void beginDrag(DragItem, Frame&, const IntPoint& mouseDownPoint, const IntPoint& mouseDraggedPoint, DataTransfer&, DragSourceAction);
> 
>@@ -135,7 +135,7 @@ struct PromisedBlobInfo;
>         void declareAndWriteDragImage(DataTransfer&, Element&, const URL&, const String& label);
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>-        PromisedBlobInfo promisedBlobInfo(Frame&, HTMLAttachmentElement&);
>+        PromisedAttachmentInfo promisedAttachmentInfo(Frame&, HTMLAttachmentElement&);
> #endif
>         Page& m_page;
>         DragClient& m_client;
>diff --git a/Source/WebCore/page/EditorClient.h b/Source/WebCore/page/EditorClient.h
>index 36ad7be869c17286cc435791cd85218550835944..8ffd7360c6aa7eb2b2c7ca90c1f4b1396bfd312b 100644
>--- a/Source/WebCore/page/EditorClient.h
>+++ b/Source/WebCore/page/EditorClient.h
>@@ -73,8 +73,12 @@ public:
>     virtual bool shouldMoveRangeAfterDelete(Range*, Range*) = 0;
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>+    virtual void registerAttachmentIdentifier(const String& /* identifier */, const String& /* contentType */, const String& /* preferredFileName */, Ref<SharedBuffer>&&) { }
>+    virtual void registerAttachmentIdentifier(const String& /* identifier */, const String& /* contentType */, const String& /* filePath */) { }
>+    virtual void cloneAttachmentData(const String& /* fromIdentifier */, const String& /* toIdentifier */) { }
>     virtual void didInsertAttachment(const String& /* identifier */, const String& /* source */) { }
>     virtual void didRemoveAttachment(const String&) { }
>+    virtual bool supportsClientSideAttachmentData() const { return false; }
> #endif
> 
>     virtual void didBeginEditing() = 0;
>diff --git a/Source/WebCore/platform/DragItem.h b/Source/WebCore/platform/DragItem.h
>index 3eae743754289ad1573d5309c9fb144bda8f71b9..5992bea18bb360d283a2e7c919fcf8c505e3bc91 100644
>--- a/Source/WebCore/platform/DragItem.h
>+++ b/Source/WebCore/platform/DragItem.h
>@@ -31,7 +31,7 @@
> #include "IntPoint.h"
> #include "IntRect.h"
> #include "PasteboardWriterData.h"
>-#include "PromisedBlobInfo.h"
>+#include "PromisedAttachmentInfo.h"
> 
> namespace WebCore {
> 
>@@ -50,7 +50,7 @@ struct DragItem final {
>     IntRect dragPreviewFrameInRootViewCoordinates;
> 
>     PasteboardWriterData data;
>-    PromisedBlobInfo promisedBlob;
>+    PromisedAttachmentInfo promisedAttachmentInfo;
> 
>     template<class Encoder> void encode(Encoder&) const;
>     template<class Decoder> static bool decode(Decoder&, DragItem&);
>@@ -71,7 +71,7 @@ void DragItem::encode(Encoder& encoder) const
>     encoder << hasVisiblePath;
>     if (hasVisiblePath)
>         encoder << image.visiblePath().value();
>-    encoder << promisedBlob;
>+    encoder << promisedAttachmentInfo;
> }
> 
> template<class Decoder>
>@@ -113,7 +113,7 @@ bool DragItem::decode(Decoder& decoder, DragItem& result)
>             return false;
>         result.image.setVisiblePath(*visiblePath);
>     }
>-    if (!decoder.decode(result.promisedBlob))
>+    if (!decoder.decode(result.promisedAttachmentInfo))
>         return false;
>     return true;
> }
>diff --git a/Source/WebCore/platform/PromisedAttachmentInfo.h b/Source/WebCore/platform/PromisedAttachmentInfo.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d38a31dbae7b52e100c9a34a09ed604f8163e9fc
>--- /dev/null
>+++ b/Source/WebCore/platform/PromisedAttachmentInfo.h
>@@ -0,0 +1,63 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#include <wtf/Forward.h>
>+#include <wtf/RefPtr.h>
>+
>+namespace WebCore {
>+
>+class SharedBuffer;
>+class URL;
>+
>+struct PromisedAttachmentInfo {
>+    URL blobURL;
>+    String contentType;
>+    String filename;
>+
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+    String attachmentIdentifier;
>+#endif
>+
>+    Vector<String> additionalTypes;
>+    Vector<RefPtr<SharedBuffer>> additionalData;
>+
>+    operator bool() const
>+    {
>+        if (contentType.isEmpty())
>+            return false;
>+
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+        if (!attachmentIdentifier.isEmpty())
>+            return true;
>+#endif
>+
>+        return !blobURL.isEmpty();
>+    }
>+};
>+
>+} // namespace WebCore
>+
>diff --git a/Source/WebCore/platform/PromisedBlobInfo.h b/Source/WebCore/platform/PromisedBlobInfo.h
>deleted file mode 100644
>index 2f4ba7092e84d7773f8e50c2e0684fa630672c54..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/PromisedBlobInfo.h
>+++ /dev/null
>@@ -1,46 +0,0 @@
>-/*
>- * Copyright (C) 2018 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>- * THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#pragma once
>-
>-#include "SharedBuffer.h"
>-
>-namespace WebCore {
>-
>-class URL;
>-
>-struct PromisedBlobInfo {
>-    URL blobURL;
>-    String contentType;
>-    String filename;
>-
>-    Vector<String> additionalTypes;
>-    Vector<RefPtr<SharedBuffer>> additionalData;
>-
>-    operator bool() const { return !blobURL.isEmpty(); }
>-};
>-
>-} // namespace WebCore
>-
>diff --git a/Source/WebKit/CMakeLists.txt b/Source/WebKit/CMakeLists.txt
>index cc76dc35624a6341fac4a28f2a94286a98c747d4..4b41ad0f703a3406dd9ba746f1198e8acb1afc7f 100644
>--- a/Source/WebKit/CMakeLists.txt
>+++ b/Source/WebKit/CMakeLists.txt
>@@ -360,6 +360,7 @@ set(WebKit_SOURCES
>     UIProcess/WebURLSchemeTask.cpp
>     UIProcess/WebViewportAttributes.cpp
> 
>+    UIProcess/API/APIAttachment.cpp
>     UIProcess/API/APIContentRuleList.cpp
>     UIProcess/API/APIContentRuleListStore.cpp
>     UIProcess/API/APIExperimentalFeature.cpp
>diff --git a/Source/WebKit/Scripts/webkit/messages.py b/Source/WebKit/Scripts/webkit/messages.py
>index a782baac9d45bb3c9d0b8992622faa6252aa184d..c2a3e4e29361f4097c1591752415ec105d5e9ff6 100644
>--- a/Source/WebKit/Scripts/webkit/messages.py
>+++ b/Source/WebKit/Scripts/webkit/messages.py
>@@ -378,7 +378,6 @@ def headers_for_type(type):
>         'String': ['<wtf/text/WTFString.h>'],
>         'PAL::SessionID': ['<pal/SessionID.h>'],
>         'WebCore::AttachmentDisplayOptions': ['<WebCore/AttachmentTypes.h>'],
>-        'WebCore::AttachmentInfo': ['<WebCore/AttachmentTypes.h>'],
>         'WebCore::AutoplayEventFlags': ['<WebCore/AutoplayEvent.h>'],
>         'WebCore::ExceptionDetails': ['<WebCore/JSDOMExceptionHandling.h>'],
>         'WebCore::FileChooserSettings': ['<WebCore/FileChooser.h>'],
>diff --git a/Source/WebKit/Shared/WebCoreArgumentCoders.cpp b/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
>index baa2fcf03e9ab2c9cff6a8adb9ff330bb03d896e..5f83e9f09c08f2fd4ab2e6d51af807a01824405c 100644
>--- a/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
>+++ b/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
>@@ -57,7 +57,7 @@
> #include <WebCore/Pasteboard.h>
> #include <WebCore/Path.h>
> #include <WebCore/PluginData.h>
>-#include <WebCore/PromisedBlobInfo.h>
>+#include <WebCore/PromisedAttachmentInfo.h>
> #include <WebCore/ProtectionSpace.h>
> #include <WebCore/RectEdges.h>
> #include <WebCore/Region.h>
>@@ -2863,15 +2863,18 @@ std::optional<MediaSelectionOption> ArgumentCoder<MediaSelectionOption>::decode(
>     return {{ WTFMove(*displayName), WTFMove(*type) }};
> }
> 
>-void ArgumentCoder<PromisedBlobInfo>::encode(Encoder& encoder, const PromisedBlobInfo& info)
>+void ArgumentCoder<PromisedAttachmentInfo>::encode(Encoder& encoder, const PromisedAttachmentInfo& info)
> {
>     encoder << info.blobURL;
>     encoder << info.contentType;
>     encoder << info.filename;
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+    encoder << info.attachmentIdentifier;
>+#endif
>     encodeTypesAndData(encoder, info.additionalTypes, info.additionalData);
> }
> 
>-bool ArgumentCoder<PromisedBlobInfo>::decode(Decoder& decoder, PromisedBlobInfo& info)
>+bool ArgumentCoder<PromisedAttachmentInfo>::decode(Decoder& decoder, PromisedAttachmentInfo& info)
> {
>     if (!decoder.decode(info.blobURL))
>         return false;
>@@ -2882,51 +2885,17 @@ bool ArgumentCoder<PromisedBlobInfo>::decode(Decoder& decoder, PromisedBlobInfo&
>     if (!decoder.decode(info.filename))
>         return false;
> 
>-    if (!decodeTypesAndData(decoder, info.additionalTypes, info.additionalData))
>-        return false;
>-
>-    return true;
>-}
>-
> #if ENABLE(ATTACHMENT_ELEMENT)
>-
>-void ArgumentCoder<AttachmentInfo>::encode(Encoder& encoder, const AttachmentInfo& info)
>-{
>-    bool dataIsNull = !info.data;
>-    encoder << info.contentType << info.name << info.filePath << dataIsNull;
>-    if (!dataIsNull) {
>-        SharedBufferDataReference dataReference { info.data.get() };
>-        encoder << static_cast<DataReference&>(dataReference);
>-    }
>-}
>-
>-bool ArgumentCoder<AttachmentInfo>::decode(Decoder& decoder, AttachmentInfo& info)
>-{
>-    if (!decoder.decode(info.contentType))
>-        return false;
>-
>-    if (!decoder.decode(info.name))
>-        return false;
>-
>-    if (!decoder.decode(info.filePath))
>+    if (!decoder.decode(info.attachmentIdentifier))
>         return false;
>+#endif
> 
>-    bool dataIsNull = true;
>-    if (!decoder.decode(dataIsNull))
>+    if (!decodeTypesAndData(decoder, info.additionalTypes, info.additionalData))
>         return false;
> 
>-    if (!dataIsNull) {
>-        DataReference dataReference;
>-        if (!decoder.decode(dataReference))
>-            return false;
>-        info.data = SharedBuffer::create(dataReference.data(), dataReference.size());
>-    }
>-
>     return true;
> }
> 
>-#endif // ENABLE(ATTACHMENT_ELEMENT)
>-
> void ArgumentCoder<Vector<RefPtr<SecurityOrigin>>>::encode(Encoder& encoder, const Vector<RefPtr<SecurityOrigin>>& origins)
> {
>     encoder << static_cast<uint64_t>(origins.size());
>diff --git a/Source/WebKit/Shared/WebCoreArgumentCoders.h b/Source/WebKit/Shared/WebCoreArgumentCoders.h
>index f2afcad596033940f1b49ad0623a089a8c539a75..8ca760fcffdcd4d8f62f6233929303385aafc35f 100644
>--- a/Source/WebKit/Shared/WebCoreArgumentCoders.h
>+++ b/Source/WebKit/Shared/WebCoreArgumentCoders.h
>@@ -95,7 +95,6 @@ class TransformationMatrix;
> class UserStyleSheet;
> class URL;
> 
>-struct AttachmentInfo;
> struct CacheQueryOptions;
> struct CompositionUnderline;
> struct DictationAlternative;
>@@ -110,7 +109,7 @@ struct PasteboardImage;
> struct PasteboardCustomData;
> struct PasteboardURL;
> struct PluginInfo;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> struct RecentSearch;
> struct ResourceLoadStatistics;
> struct ScrollableAreaParameters;
>@@ -699,20 +698,11 @@ template<> struct ArgumentCoder<WebCore::MediaSelectionOption> {
>     static std::optional<WebCore::MediaSelectionOption> decode(Decoder&);
> };
> 
>-template<> struct ArgumentCoder<WebCore::PromisedBlobInfo> {
>-    static void encode(Encoder&, const WebCore::PromisedBlobInfo&);
>-    static bool decode(Decoder&, WebCore::PromisedBlobInfo&);
>+template<> struct ArgumentCoder<WebCore::PromisedAttachmentInfo> {
>+    static void encode(Encoder&, const WebCore::PromisedAttachmentInfo&);
>+    static bool decode(Decoder&, WebCore::PromisedAttachmentInfo&);
> };
> 
>-#if ENABLE(ATTACHMENT_ELEMENT)
>-
>-template<> struct ArgumentCoder<WebCore::AttachmentInfo> {
>-    static void encode(Encoder&, const WebCore::AttachmentInfo&);
>-    static bool decode(Decoder&, WebCore::AttachmentInfo&);
>-};
>-
>-#endif
>-
> template<> struct ArgumentCoder<Vector<RefPtr<WebCore::SecurityOrigin>>> {
>     static void encode(Encoder&, const Vector<RefPtr<WebCore::SecurityOrigin>>&);
>     static bool decode(Decoder&, Vector<RefPtr<WebCore::SecurityOrigin>>&);
>diff --git a/Source/WebKit/UIProcess/API/APIAttachment.cpp b/Source/WebKit/UIProcess/API/APIAttachment.cpp
>index 7e009d6b2e559cd85b98466812119a4c8b9696e2..927c38c9deaa318f02020865641ade11527fce21 100644
>--- a/Source/WebKit/UIProcess/API/APIAttachment.cpp
>+++ b/Source/WebKit/UIProcess/API/APIAttachment.cpp
>@@ -28,7 +28,6 @@
> 
> #include <WebCore/AttachmentTypes.h>
> #include <WebCore/SharedBuffer.h>
>-#include <wtf/BlockPtr.h>
> #include <wtf/text/WTFString.h>
> 
> namespace API {
>@@ -48,14 +47,6 @@ Attachment::~Attachment()
> {
> }
> 
>-void Attachment::requestInfo(Function<void(const WebCore::AttachmentInfo&, WebKit::CallbackBase::Error)>&& callback)
>-{
>-    if (m_webPage)
>-        m_webPage->requestAttachmentInfo(m_identifier, WTFMove(callback));
>-    else
>-        callback({ }, WebKit::CallbackBase::Error::OwnerWasInvalidated);
>-}
>-
> void Attachment::setDisplayOptions(WebCore::AttachmentDisplayOptions options, Function<void(WebKit::CallbackBase::Error)>&& callback)
> {
>     if (m_webPage)
>@@ -64,12 +55,15 @@ void Attachment::setDisplayOptions(WebCore::AttachmentDisplayOptions options, Fu
>         callback(WebKit::CallbackBase::Error::OwnerWasInvalidated);
> }
> 
>-void Attachment::setDataAndContentType(WebCore::SharedBuffer& data, const WTF::String& newContentType, const WTF::String& newFilename, Function<void(WebKit::CallbackBase::Error)>&& callback)
>+void Attachment::updateAttributes(uint64_t fileSize, const WTF::String& newContentType, const WTF::String& newFilename, Function<void(WebKit::CallbackBase::Error)>&& callback)
> {
>+    setContentType(newContentType);
>+    setFilePath({ });
>+
>     auto optionalNewContentType = newContentType.isNull() ? std::nullopt : std::optional<WTF::String> { newContentType };
>     auto optionalNewFilename = newFilename.isNull() ? std::nullopt : std::optional<WTF::String> { newFilename };
>     if (m_webPage)
>-        m_webPage->setAttachmentDataAndContentType(m_identifier, data, WTFMove(optionalNewContentType), WTFMove(optionalNewFilename), WTFMove(callback));
>+        m_webPage->updateAttachmentAttributes(m_identifier, fileSize, WTFMove(optionalNewContentType), WTFMove(optionalNewFilename), WTFMove(callback));
>     else
>         callback(WebKit::CallbackBase::Error::OwnerWasInvalidated);
> }
>diff --git a/Source/WebKit/UIProcess/API/APIAttachment.h b/Source/WebKit/UIProcess/API/APIAttachment.h
>index bf7a2274296221ffadbe07892e76eefdd75cb898..e7ea9cdf905517a2f8193af627cac4cb9e85f9d4 100644
>--- a/Source/WebKit/UIProcess/API/APIAttachment.h
>+++ b/Source/WebKit/UIProcess/API/APIAttachment.h
>@@ -32,10 +32,11 @@
> #include <wtf/WeakPtr.h>
> #include <wtf/text/WTFString.h>
> 
>+OBJC_CLASS NSFileWrapper;
>+
> namespace WebCore {
> class SharedBuffer;
> struct AttachmentDisplayOptions;
>-struct AttachmentInfo;
> }
> 
> namespace WebKit {
>@@ -50,14 +51,29 @@ public:
>     virtual ~Attachment();
> 
>     const WTF::String& identifier() const { return m_identifier; }
>-    void requestInfo(Function<void(const WebCore::AttachmentInfo&, WebKit::CallbackBase::Error)>&&);
>     void setDisplayOptions(WebCore::AttachmentDisplayOptions, Function<void(WebKit::CallbackBase::Error)>&&);
>-    void setDataAndContentType(WebCore::SharedBuffer&, const WTF::String& newContentType, const WTF::String& newFilename, Function<void(WebKit::CallbackBase::Error)>&&);
>+    void updateAttributes(uint64_t fileSize, const WTF::String& newContentType, const WTF::String& newFilename, Function<void(WebKit::CallbackBase::Error)>&&);
>+
>+#if PLATFORM(COCOA)
>+    NSFileWrapper *fileWrapper() const { return m_fileWrapper.get(); }
>+    void setFileWrapper(NSFileWrapper *fileWrapper) { m_fileWrapper = fileWrapper; }
>+#endif
>+
>+    const WTF::String& filePath() const { return m_filePath; }
>+    void setFilePath(const WTF::String& filePath) { m_filePath = filePath; }
>+
>+    const WTF::String& contentType() const { return m_contentType; }
>+    void setContentType(const WTF::String& contentType) { m_contentType = contentType; }
> 
> private:
>     explicit Attachment(const WTF::String& identifier, WebKit::WebPageProxy&);
> 
>+#if PLATFORM(COCOA)
>+    RetainPtr<NSFileWrapper> m_fileWrapper;
>+#endif
>     WTF::String m_identifier;
>+    WTF::String m_filePath;
>+    WTF::String m_contentType;
>     WeakPtr<WebKit::WebPageProxy> m_webPage;
> };
> 
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegatePrivate.h b/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegatePrivate.h
>index f68cad1bcdc3bcd5af819e59432401d7e7df6cea..4c26439c4f71eb80c121b90f3f4a35f574807017 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegatePrivate.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegatePrivate.h
>@@ -114,7 +114,6 @@ struct UIEdgeInsets;
> - (void)_webView:(WKWebView *)webView editorStateDidChange:(NSDictionary *)editorState WK_API_AVAILABLE(macosx(10.13.4), ios(11.3));
> 
> - (void)_webView:(WKWebView *)webView didRemoveAttachment:(_WKAttachment *)attachment WK_API_AVAILABLE(macosx(10.13.4), ios(11.3));
>-- (void)_webView:(WKWebView *)webView didInsertAttachment:(_WKAttachment *)attachment WK_API_AVAILABLE(macosx(10.13.4), ios(11.3));
> - (void)_webView:(WKWebView *)webView didInsertAttachment:(_WKAttachment *)attachment withSource:(NSString *)source WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
> 
> - (void)_webView:(WKWebView *)webView didResignInputElementStrongPasswordAppearanceWithUserInfo:(id <NSSecureCoding>)userInfo WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>index f02301813e02af3362bfc5b3c47e39dafd1c4f5e..932dd90474dcf25666b956483d9a901cc88f2519 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>@@ -1212,17 +1212,25 @@ static NSDictionary *dictionaryRepresentationForEditorState(const WebKit::Editor
> - (void)_didInsertAttachment:(NSString *)identifier withSource:(NSString *)source
> {
>     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
>-    if ([uiDelegate respondsToSelector:@selector(_webView:didInsertAttachment:withSource:)])
>-        [uiDelegate _webView:self didInsertAttachment:wrapper(API::Attachment::create(identifier, *_page)) withSource:source];
>-    else if ([uiDelegate respondsToSelector:@selector(_webView:didInsertAttachment:)])
>-        [uiDelegate _webView:self didInsertAttachment:wrapper(API::Attachment::create(identifier, *_page))];
>+    if (![uiDelegate respondsToSelector:@selector(_webView:didInsertAttachment:withSource:)])
>+        return;
>+
>+    if (auto attachment = _page->attachmentForIdentifier(identifier))
>+        [uiDelegate _webView:self didInsertAttachment:wrapper(*attachment) withSource:source];
>+    else
>+        ASSERT_NOT_REACHED();
> }
> 
> - (void)_didRemoveAttachment:(NSString *)identifier
> {
>     id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
>-    if ([uiDelegate respondsToSelector:@selector(_webView:didRemoveAttachment:)])
>-        [uiDelegate _webView:self didRemoveAttachment:wrapper(API::Attachment::create(identifier, *_page))];
>+    if (![uiDelegate respondsToSelector:@selector(_webView:didRemoveAttachment:)])
>+        return;
>+
>+    if (auto attachment = _page->attachmentForIdentifier(identifier))
>+        [uiDelegate _webView:self didRemoveAttachment:wrapper(*attachment)];
>+    else
>+        ASSERT_NOT_REACHED();
> }
> 
> #endif // ENABLE(ATTACHMENT_ELEMENT)
>@@ -4398,18 +4406,38 @@ WEBCORE_COMMAND(yankAndSelect)
> }
> 
> - (_WKAttachment *)_insertAttachmentWithFilename:(NSString *)filename contentType:(NSString *)contentType data:(NSData *)data options:(_WKAttachmentDisplayOptions *)options completion:(void(^)(BOOL success))completionHandler
>+{
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:data]);
>+    if (filename)
>+        [fileWrapper setPreferredFilename:filename];
>+    return [self _insertAttachmentWithFileWrapper:fileWrapper.get() contentType:contentType options:options completion:completionHandler];
>+}
>+
>+- (_WKAttachment *)_insertAttachmentWithFileWrapper:(NSFileWrapper *)fileWrapper contentType:(NSString *)contentType options:(_WKAttachmentDisplayOptions *)options completion:(void(^)(BOOL success))completionHandler
> {
> #if ENABLE(ATTACHMENT_ELEMENT)
>     auto identifier = createCanonicalUUIDString();
>-
>     auto coreOptions = options ? options.coreDisplayOptions : WebCore::AttachmentDisplayOptions { };
>-    auto buffer = WebCore::SharedBuffer::create(data);
>-    _page->insertAttachment(identifier, coreOptions, filename, contentType.length ? std::optional<String> { contentType } : std::nullopt, buffer.get(), [capturedHandler = makeBlockPtr(completionHandler), capturedBuffer = buffer.copyRef()] (WebKit::CallbackBase::Error error) {
>+    auto attachment = API::Attachment::create(identifier, *_page);
>+    attachment->setFileWrapper(fileWrapper);
>+
>+    if (!contentType.length) {
>+        if (NSString *pathExtension = (fileWrapper.filename.length ? fileWrapper.filename : fileWrapper.preferredFilename).pathExtension) {
>+            auto typeIdentifier = adoptCF(UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (CFStringRef)pathExtension, NULL));
>+            contentType = (NSString *)CFAutorelease(UTTypeCopyPreferredTagWithClass(typeIdentifier.get(), kUTTagClassMIMEType));
>+        }
>+    }
>+
>+    auto fileSize = [[[fileWrapper fileAttributes] objectForKey:NSFileSize] unsignedLongLongValue];
>+    if (!fileSize && fileWrapper.regularFile)
>+        fileSize = fileWrapper.regularFileContents.length;
>+
>+    _page->insertAttachment(attachment.copyRef(), coreOptions, fileSize, [fileWrapper preferredFilename], contentType.length ? std::optional<String> { contentType } : std::nullopt, [capturedHandler = makeBlockPtr(completionHandler)] (WebKit::CallbackBase::Error error) {
>         if (capturedHandler)
>             capturedHandler(error == WebKit::CallbackBase::Error::None);
>     });
> 
>-    return wrapper(API::Attachment::create(identifier, *_page));
>+    return wrapper(attachment);
> #else
>     return nil;
> #endif
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>index 581a4a67d18686b61128f867fb4981a7c6f7fc29..d0cf2b8c0743cd80a611b970b0bc989e20599645 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>@@ -180,7 +180,8 @@ typedef NS_OPTIONS(NSUInteger, _WKRectEdge) {
> 
> @property (nonatomic, setter=_setBackgroundExtendsBeyondPage:) BOOL _backgroundExtendsBeyondPage WK_API_AVAILABLE(macosx(10.13.4), ios(8.0));
> 
>-- (_WKAttachment *)_insertAttachmentWithFilename:(NSString *)filename contentType:(NSString *)contentType data:(NSData *)data options:(_WKAttachmentDisplayOptions *)options completion:(void(^)(BOOL success))completionHandler WK_API_AVAILABLE(macosx(10.13.4), ios(11.3));
>+- (_WKAttachment *)_insertAttachmentWithFilename:(NSString *)filename contentType:(NSString *)contentType data:(NSData *)data options:(_WKAttachmentDisplayOptions *)options completion:(void(^)(BOOL success))completionHandler WK_API_DEPRECATED_WITH_REPLACEMENT("-_insertAttachmentWithFileWrapper:contentType:options:completion:", macosx(10.13.4, WK_MAC_TBA), ios(11.3, WK_IOS_TBA));
>+- (_WKAttachment *)_insertAttachmentWithFileWrapper:(NSFileWrapper *)fileWrapper contentType:(NSString *)contentType options:(_WKAttachmentDisplayOptions *)options completion:(void(^)(BOOL success))completionHandler WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
> 
> #if TARGET_OS_IPHONE
> // DERECATED: The setters of the three following function are deprecated, please use overrideLayoutParameters.
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.h b/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.h
>index 0829939fbbca2cb27e6069860c466ffb8d304cfb..c737c2e535faf690d1e23bd7503053ca329998e7 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.h
>@@ -44,19 +44,26 @@ WK_CLASS_AVAILABLE(macosx(10.13.4), ios(11.3))
> 
> WK_CLASS_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA))
> @interface _WKAttachmentInfo : NSObject
>-@property (nonatomic, readonly) NSString *contentType;
>-@property (nonatomic, readonly) NSString *name;
>-@property (nonatomic, readonly) NSString *filePath;
>+@property (nonatomic, readonly, nullable) NSString *contentType;
>+@property (nonatomic, readonly, nullable) NSString *name;
>+@property (nonatomic, readonly, nullable) NSString *filePath;
> @property (nonatomic, readonly, nullable) NSData *data;
>+@property (nonatomic, readonly) NSFileWrapper *fileWrapper;
> @end
> 
> WK_CLASS_AVAILABLE(macosx(10.13.4), ios(11.3))
> @interface _WKAttachment : NSObject
>-- (void)requestInfo:(void(^)(_WKAttachmentInfo * _Nullable, NSError * _Nullable))completionHandler WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
>-- (void)requestData:(void(^)(NSData * _Nullable, NSError * _Nullable))completionHandler;
>+
> - (void)setDisplayOptions:(_WKAttachmentDisplayOptions *)options completion:(void(^ _Nullable)(NSError * _Nullable))completionHandler;
>-- (void)setData:(NSData *)data newContentType:(nullable NSString *)newContentType newFilename:(nullable NSString *)newFilename completion:(void(^ _Nullable)(NSError * _Nullable))completionHandler;
>+- (void)setFileWrapper:(NSFileWrapper *)fileWrapper contentType:(nullable NSString *)contentType completion:(void(^ _Nullable)(NSError * _Nullable))completionHandler WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
>+
>+@property (nonatomic, readonly) _WKAttachmentInfo *info WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
> @property (nonatomic, readonly) NSString *uniqueIdentifier;
>+
>+// Deprecated SPI.
>+- (void)requestInfo:(void(^)(_WKAttachmentInfo * _Nullable, NSError * _Nullable))completionHandler WK_API_DEPRECATED_WITH_REPLACEMENT("-info", macosx(WK_MAC_TBA, WK_MAC_TBA), ios(WK_IOS_TBA, WK_IOS_TBA));
>+- (void)setData:(NSData *)data newContentType:(nullable NSString *)newContentType newFilename:(nullable NSString *)newFilename completion:(void(^ _Nullable)(NSError * _Nullable))completionHandler WK_API_DEPRECATED_WITH_REPLACEMENT("Please use -setFileWrapper:contentType:completion: instead.", macosx(10.13.4, WK_MAC_TBA), ios(11.3, WK_IOS_TBA));
>+
> @end
> 
> NS_ASSUME_NONNULL_END
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.mm b/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.mm
>index 5f00c8cee2a3f5cd615a886ca57a1afb272a741d..e5c9e7b4ef923c72d3f00fdafe3a57c90c8c7bf0 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.mm
>+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKAttachment.mm
>@@ -35,6 +35,10 @@
> #import <WebCore/SharedBuffer.h>
> #import <wtf/BlockPtr.h>
> 
>+#if PLATFORM(IOS)
>+#import <MobileCoreServices/MobileCoreServices.h>
>+#endif
>+
> using namespace WebKit;
> 
> @implementation _WKAttachmentDisplayOptions : NSObject
>@@ -47,41 +51,36 @@ using namespace WebKit;
> @end
> 
> @implementation _WKAttachmentInfo {
>-    RetainPtr<NSData> _data;
>-    RetainPtr<NSString> _name;
>-    RetainPtr<NSString> _filePath;
>+    RetainPtr<NSFileWrapper> _fileWrapper;
>     RetainPtr<NSString> _contentType;
>-    RetainPtr<NSError> _fileLoadingError;
>+    RetainPtr<NSString> _filePath;
> }
> 
>-- (instancetype)initWithInfo:(const WebCore::AttachmentInfo&)info
>+- (instancetype)initWithFileWrapper:(NSFileWrapper *)fileWrapper filePath:(NSString *)filePath contentType:(NSString *)contentType
> {
>     if (!(self = [super init]))
>         return nil;
> 
>-    _data = info.data ? info.data->createNSData() : nil;
>-    _contentType = adoptNS([(NSString *)info.contentType ?: @"" copy]);
>-    _name = adoptNS([(NSString *)info.name ?: @"" copy]);
>-    _filePath = adoptNS([(NSString *)info.filePath ?: @"" copy]);
>-    _fileLoadingError = nil;
>-
>-    if (!_data && [_filePath length]) {
>-        NSError *error = nil;
>-        _data = [NSData dataWithContentsOfFile:_filePath.get() options:NSDataReadingMappedIfSafe error:&error];
>-        _fileLoadingError = error;
>-    }
>-
>+    _fileWrapper = fileWrapper;
>+    _filePath = filePath;
>+    _contentType = contentType;
>     return self;
> }
> 
> - (NSData *)data
> {
>-    return _data.get();
>+    if (![_fileWrapper isRegularFile])
>+        return nil;
>+
>+    return [_fileWrapper regularFileContents];
> }
> 
> - (NSString *)name
> {
>-    return _name.get();
>+    if ([_fileWrapper filename].length)
>+        return [_fileWrapper filename];
>+
>+    return [_fileWrapper preferredFilename];
> }
> 
> - (NSString *)filePath
>@@ -89,14 +88,47 @@ using namespace WebKit;
>     return _filePath.get();
> }
> 
>+static BOOL isDeclaredOrDynamicTypeIdentifier(NSString *type)
>+{
>+    return UTTypeIsDeclared((CFStringRef)type) || UTTypeIsDynamic((CFStringRef)type);
>+}
>+
>+- (NSString *)_typeIdentifierFromPathExtension
>+{
>+    NSString *extension = self.name.pathExtension;
>+    auto typeIdentifier = adoptCF(UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (CFStringRef)extension, nil));
>+    return (NSString *)typeIdentifier.autorelease();
>+}
>+
> - (NSString *)contentType
> {
>-    return _contentType.get();
>+    // A "content type" can refer to either a UTI or a MIME type. We prefer MIME type here to preserve existing behavior.
>+    return self.mimeType ?: self.utiType;
>+}
>+
>+- (NSString *)mimeType
>+{
>+    NSString *contentType = [_contentType length] ? _contentType.get() : [self _typeIdentifierFromPathExtension];
>+    if (!isDeclaredOrDynamicTypeIdentifier(contentType))
>+        return contentType;
>+
>+    auto mimeType = adoptCF(UTTypeCopyPreferredTagWithClass((CFStringRef)contentType, kUTTagClassMIMEType));
>+    return (NSString *)mimeType.autorelease();
>+}
>+
>+- (NSString *)utiType
>+{
>+    NSString *contentType = [_contentType length] ? _contentType.get() : [self _typeIdentifierFromPathExtension];
>+    if (isDeclaredOrDynamicTypeIdentifier(contentType))
>+        return contentType;
>+
>+    auto utiType = adoptCF(UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, (CFStringRef)contentType, nil));
>+    return (NSString *)utiType.autorelease();
> }
> 
>-- (NSError *)fileLoadingError
>+- (NSFileWrapper *)fileWrapper
> {
>-    return _fileLoadingError.get();
>+    return _fileWrapper.get();
> }
> 
> @end
>@@ -108,37 +140,14 @@ using namespace WebKit;
>     return *_attachment;
> }
> 
>-- (BOOL)isEqual:(id)object
>+- (_WKAttachmentInfo *)info
> {
>-    return [object isKindOfClass:[_WKAttachment class]] && [self.uniqueIdentifier isEqual:[(_WKAttachment *)object uniqueIdentifier]];
>+    return [[[_WKAttachmentInfo alloc] initWithFileWrapper:_attachment->fileWrapper() filePath:_attachment->filePath() contentType:_attachment->contentType()] autorelease];
> }
> 
> - (void)requestInfo:(void(^)(_WKAttachmentInfo *, NSError *))completionHandler
> {
>-    _attachment->requestInfo([capturedBlock = makeBlockPtr(completionHandler)] (const WebCore::AttachmentInfo& info, CallbackBase::Error error) {
>-        if (!capturedBlock)
>-            return;
>-
>-        if (error != CallbackBase::Error::None) {
>-            capturedBlock(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorWebViewInvalidated userInfo:nil]);
>-            return;
>-        }
>-
>-        auto attachmentInfo = adoptNS([[_WKAttachmentInfo alloc] initWithInfo:info]);
>-        if (NSError *fileLoadingError = [attachmentInfo fileLoadingError]) {
>-            capturedBlock(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorUnknown userInfo:@{ NSUnderlyingErrorKey : fileLoadingError }]);
>-            return;
>-        }
>-
>-        capturedBlock(attachmentInfo.get(), nil);
>-    });
>-}
>-
>-- (void)requestData:(void(^)(NSData *, NSError *))completionHandler
>-{
>-    [self requestInfo:[protectedBlock = makeBlockPtr(completionHandler)] (_WKAttachmentInfo *info, NSError *error) {
>-        protectedBlock(info.data, error);
>-    }];
>+    completionHandler(self.info, nil);
> }
> 
> - (void)setDisplayOptions:(_WKAttachmentDisplayOptions *)options completion:(void(^)(NSError *))completionHandler
>@@ -155,10 +164,14 @@ using namespace WebKit;
>     });
> }
> 
>-- (void)setData:(NSData *)data newContentType:(NSString *)newContentType newFilename:(NSString *)newFilename completion:(void(^)(NSError *))completionHandler
>+- (void)setFileWrapper:(NSFileWrapper *)fileWrapper contentType:(NSString *)contentType completion:(void (^)(NSError *))completionHandler
> {
>-    auto buffer = WebCore::SharedBuffer::create(data);
>-    _attachment->setDataAndContentType(buffer.get(), newContentType, newFilename, [capturedBlock = makeBlockPtr(completionHandler), capturedBuffer = buffer.copyRef()] (CallbackBase::Error error) {
>+    auto fileSize = [[[fileWrapper fileAttributes] objectForKey:NSFileSize] unsignedLongLongValue];
>+    if (!fileSize && fileWrapper.regularFile)
>+        fileSize = fileWrapper.regularFileContents.length;
>+
>+    _attachment->setFileWrapper(fileWrapper);
>+    _attachment->updateAttributes(fileSize, contentType, [fileWrapper preferredFilename], [capturedBlock = makeBlockPtr(completionHandler)] (auto error) {
>         if (!capturedBlock)
>             return;
> 
>@@ -169,19 +182,22 @@ using namespace WebKit;
>     });
> }
> 
>-- (NSString *)uniqueIdentifier
>+- (void)setData:(NSData *)data newContentType:(NSString *)newContentType newFilename:(NSString *)newFilename completion:(void(^)(NSError *))completionHandler
> {
>-    return _attachment->identifier();
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:data]);
>+    if (newFilename)
>+        [fileWrapper setPreferredFilename:newFilename];
>+    [self setFileWrapper:fileWrapper.get() contentType:newContentType completion:completionHandler];
> }
> 
>-- (NSUInteger)hash
>+- (NSString *)uniqueIdentifier
> {
>-    return [self.uniqueIdentifier hash];
>+    return _attachment->identifier();
> }
> 
> - (NSString *)description
> {
>-    return [NSString stringWithFormat:@"<%@ id='%@'>", [self class], self.uniqueIdentifier];
>+    return [NSString stringWithFormat:@"<%@ %p id='%@'>", [self class], self, self.uniqueIdentifier];
> }
> 
> @end
>diff --git a/Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.mm b/Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.mm
>index 837ec1a025cae4ca93da0f106610541ffa254e7c..d6e0e4297101b645489f908d80e58b88cb01f63c 100644
>--- a/Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.mm
>+++ b/Source/WebKit/UIProcess/Cocoa/PageClientImplCocoa.mm
>@@ -52,6 +52,7 @@ void PageClientImplCocoa::didInsertAttachment(const String& identifier, const St
>     [m_webView _didInsertAttachment:identifier withSource:source];
> #else
>     UNUSED_PARAM(identifier);
>+    UNUSED_PARAM(source);
> #endif
> }
> 
>diff --git a/Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm b/Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm
>index 5ba28240c0cd5fddc7f85e52700a9e423daf4099..ecdc6881b584206c1d224dd1d1c352aacfa9d7b5 100644
>--- a/Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm
>+++ b/Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm
>@@ -26,6 +26,7 @@
> #import "config.h"
> #import "WebPageProxy.h"
> 
>+#import "APIAttachment.h"
> #import "APIUIClient.h"
> #import "DataDetectionResult.h"
> #import "LoadParameters.h"
>@@ -160,4 +161,27 @@ void WebPageProxy::setDragCaretRect(const IntRect& dragCaretRect)
> 
> #endif // ENABLE(DRAG_SUPPORT)
> 
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+
>+void WebPageProxy::platformRegisterAttachment(Ref<API::Attachment>&& attachment, const String& preferredFileName, const IPC::DataReference& dataReference)
>+{
>+    auto buffer = SharedBuffer::create(dataReference.data(), dataReference.size());
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:buffer->createNSData().autorelease()]);
>+    [fileWrapper setPreferredFilename:preferredFileName];
>+    attachment->setFileWrapper(fileWrapper.get());
>+}
>+
>+void WebPageProxy::platformRegisterAttachment(Ref<API::Attachment>&& attachment, const String& filePath)
>+{
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initWithURL:[NSURL fileURLWithPath:filePath] options:0 error:nil]);
>+    attachment->setFileWrapper(fileWrapper.get());
>+}
>+
>+void WebPageProxy::platformCloneAttachment(Ref<API::Attachment>&& fromAttachment, Ref<API::Attachment>&& toAttachment)
>+{
>+    toAttachment->setFileWrapper(fromAttachment->fileWrapper());
>+}
>+
>+#endif // ENABLE(ATTACHMENT_ELEMENT)
>+
> }
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
>index 270423f6eb139a68bf5cb18f8eef5a7c3868a4cb..60d965015a34933dbd43770682b79e87378a1d21 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
>+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
>@@ -5601,22 +5601,6 @@ void WebPageProxy::voidCallback(CallbackID callbackID)
>     callback->performCallback();
> }
> 
>-#if ENABLE(ATTACHMENT_ELEMENT)
>-
>-void WebPageProxy::attachmentInfoCallback(const WebCore::AttachmentInfo& info, CallbackID callbackID)
>-{
>-    auto callback = m_callbacks.take<AttachmentInfoCallback>(callbackID);
>-    if (!callback) {
>-        ASSERT_NOT_REACHED();
>-        return;
>-    }
>-
>-    MESSAGE_CHECK_URL(info.filePath);
>-    callback->performCallbackWithReturnValue(info);
>-}
>-
>-#endif
>-
> void WebPageProxy::dataCallback(const IPC::DataReference& dataReference, CallbackID callbackID)
> {
>     auto callback = m_callbacks.take<DataCallback>(callbackID);
>@@ -6196,6 +6180,12 @@ void WebPageProxy::resetStateAfterProcessExited(ProcessTerminationReason termina
>     m_touchEventQueue.clear();
> #endif
> 
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+    for (auto identifier : m_attachmentIdentifierToAttachmentMap.keys())
>+        m_pageClient.didRemoveAttachment(identifier);
>+    m_attachmentIdentifierToAttachmentMap.clear();
>+#endif
>+
>     if (terminationReason != ProcessTerminationReason::NavigationSwap) {
>         PageLoadState::Transaction transaction = m_pageLoadState.transaction();
>         m_pageLoadState.reset(transaction);
>@@ -7741,26 +7731,29 @@ void WebPageProxy::touchBarMenuItemDataRemoved(const TouchBarMenuItemData& touch
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
> 
>-void WebPageProxy::insertAttachment(const String& identifier, const AttachmentDisplayOptions& options, const String& filename, std::optional<String> contentType, SharedBuffer& data, Function<void(CallbackBase::Error)>&& callback)
>+RefPtr<API::Attachment> WebPageProxy::attachmentForIdentifier(const String& identifier) const
> {
>-    if (!isValid()) {
>-        callback(CallbackBase::Error::OwnerWasInvalidated);
>-        return;
>-    }
>+    if (identifier.isEmpty())
>+        return nullptr;
> 
>-    auto callbackID = m_callbacks.put(WTFMove(callback), m_process->throttler().backgroundActivityToken());
>-    m_process->send(Messages::WebPage::InsertAttachment(identifier, options, filename, contentType, IPC::SharedBufferDataReference { &data }, callbackID), m_pageID);
>+    return m_attachmentIdentifierToAttachmentMap.get(identifier);
> }
> 
>-void WebPageProxy::requestAttachmentInfo(const String& identifier, Function<void(const AttachmentInfo&, CallbackBase::Error)>&& callback)
>+void WebPageProxy::insertAttachment(Ref<API::Attachment>&& attachment, const AttachmentDisplayOptions& options, uint64_t fileSize, const String& filename, std::optional<String> contentType, Function<void(CallbackBase::Error)>&& callback)
> {
>     if (!isValid()) {
>-        callback({ }, CallbackBase::Error::OwnerWasInvalidated);
>+        callback(CallbackBase::Error::OwnerWasInvalidated);
>         return;
>     }
> 
>+    if (contentType)
>+        attachment->setContentType(*contentType);
>+
>+    auto attachmentIdentifier = attachment->identifier();
>+    m_attachmentIdentifierToAttachmentMap.set(attachmentIdentifier, WTFMove(attachment));
>+
>     auto callbackID = m_callbacks.put(WTFMove(callback), m_process->throttler().backgroundActivityToken());
>-    m_process->send(Messages::WebPage::RequestAttachmentInfo(identifier, callbackID), m_pageID);
>+    m_process->send(Messages::WebPage::InsertAttachment(attachmentIdentifier, options, fileSize, filename, contentType, callbackID), m_pageID);
> }
> 
> void WebPageProxy::setAttachmentDisplayOptions(const String& identifier, AttachmentDisplayOptions options, Function<void(CallbackBase::Error)>&& callback)
>@@ -7774,7 +7767,7 @@ void WebPageProxy::setAttachmentDisplayOptions(const String& identifier, Attachm
>     m_process->send(Messages::WebPage::SetAttachmentDisplayOptions(identifier, options, callbackID), m_pageID);
> }
> 
>-void WebPageProxy::setAttachmentDataAndContentType(const String& identifier, SharedBuffer& data, std::optional<String>&& newContentType, std::optional<String>&& newFilename, Function<void(CallbackBase::Error)>&& callback)
>+void WebPageProxy::updateAttachmentAttributes(const String& identifier, uint64_t fileSize, std::optional<String>&& newContentType, std::optional<String>&& newFilename, Function<void(CallbackBase::Error)>&& callback)
> {
>     if (!isValid()) {
>         callback(CallbackBase::Error::OwnerWasInvalidated);
>@@ -7782,19 +7775,87 @@ void WebPageProxy::setAttachmentDataAndContentType(const String& identifier, Sha
>     }
> 
>     auto callbackID = m_callbacks.put(WTFMove(callback), m_process->throttler().backgroundActivityToken());
>-    m_process->send(Messages::WebPage::SetAttachmentDataAndContentType(identifier, IPC::SharedBufferDataReference { &data }, WTFMove(newContentType), WTFMove(newFilename), callbackID), m_pageID);
>+    m_process->send(Messages::WebPage::UpdateAttachmentAttributes(identifier, fileSize, WTFMove(newContentType), WTFMove(newFilename), callbackID), m_pageID);
> }
> 
>+void WebPageProxy::registerAttachmentIdentifierFromData(const String& identifier, const String& contentType, const String& preferredFileName, const IPC::DataReference& data)
>+{
>+    if (attachmentForIdentifier(identifier))
>+        return;
>+
>+    auto attachment = ensureAttachment(identifier);
>+    attachment->setContentType(contentType);
>+    m_attachmentIdentifierToAttachmentMap.set(identifier, attachment.copyRef());
>+
>+    platformRegisterAttachment(WTFMove(attachment), preferredFileName, data);
>+}
>+
>+void WebPageProxy::registerAttachmentIdentifierFromFilePath(const String& identifier, const String& contentType, const String& filePath)
>+{
>+    if (attachmentForIdentifier(identifier))
>+        return;
>+
>+    auto attachment = ensureAttachment(identifier);
>+    attachment->setContentType(contentType);
>+    attachment->setFilePath(filePath);
>+    m_attachmentIdentifierToAttachmentMap.set(identifier, attachment.copyRef());
>+
>+    platformRegisterAttachment(WTFMove(attachment), filePath);
>+}
>+
>+void WebPageProxy::cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier)
>+{
>+    auto newAttachment = ensureAttachment(toIdentifier);
>+    auto existingAttachment = attachmentForIdentifier(fromIdentifier);
>+    if (!existingAttachment) {
>+        ASSERT_NOT_REACHED();
>+        return;
>+    }
>+
>+    newAttachment->setContentType(existingAttachment->contentType());
>+    newAttachment->setFilePath(existingAttachment->filePath());
>+
>+    platformCloneAttachment(existingAttachment.releaseNonNull(), WTFMove(newAttachment));
>+}
>+
>+#if !PLATFORM(COCOA)
>+
>+void WebPageProxy::platformRegisterAttachment(Ref<API::Attachment>&&, const String& preferredFileName, const IPC::DataReference&)
>+{
>+}
>+
>+void WebPageProxy::platformRegisterAttachment(Ref<API::Attachment>&&, const String&)
>+{
>+}
>+
>+void WebPageProxy::platformCloneAttachment(Ref<API::Attachment>&&, Ref<API::Attachment>&&)
>+{
>+}
>+
>+#endif
>+
> void WebPageProxy::didInsertAttachment(const String& identifier, const String& source)
> {
>+    ensureAttachment(identifier);
>     m_pageClient.didInsertAttachment(identifier, source);
> }
> 
> void WebPageProxy::didRemoveAttachment(const String& identifier)
> {
>+    ASSERT(attachmentForIdentifier(identifier));
>     m_pageClient.didRemoveAttachment(identifier);
> }
> 
>+Ref<API::Attachment> WebPageProxy::ensureAttachment(const String& identifier)
>+{
>+    if (auto existingAttachment = attachmentForIdentifier(identifier))
>+        return *existingAttachment;
>+
>+    auto attachment = API::Attachment::create(identifier, *this);
>+    m_attachmentIdentifierToAttachmentMap.set(identifier, attachment.copyRef());
>+    return attachment;
>+}
>+
> #endif // ENABLE(ATTACHMENT_ELEMENT)
> 
> void WebPageProxy::writeBlobToFilePath(const URL& url, const String& path, Function<void(bool success)>&& callback)
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.h b/Source/WebKit/UIProcess/WebPageProxy.h
>index a6f9587d43ecbb0a9eb4f6e560f3acfb2f9e2fe0..e4c57d90a7ae57c02d1bacb8accd63cfd31a8a59 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.h
>+++ b/Source/WebKit/UIProcess/WebPageProxy.h
>@@ -135,6 +135,7 @@ class MediaSessionMetadata;
> #endif
> 
> namespace API {
>+class Attachment;
> class ContextMenuClient;
> class FindClient;
> class FindMatchesClient;
>@@ -197,7 +198,6 @@ using FloatBoxExtent = RectEdges<float>;
> #if ENABLE(ATTACHMENT_ELEMENT)
> namespace WebCore {
> struct AttachmentDisplayOptions;
>-struct AttachmentInfo;
> }
> #endif
> 
>@@ -275,10 +275,6 @@ typedef GenericCallback<EditingRange> EditingRangeCallback;
> typedef GenericCallback<const String&> StringCallback;
> typedef GenericCallback<API::SerializedScriptValue*, bool, const WebCore::ExceptionDetails&> ScriptValueCallback;
> 
>-#if ENABLE(ATTACHMENT_ELEMENT)
>-typedef GenericCallback<const WebCore::AttachmentInfo&> AttachmentInfoCallback;
>-#endif
>-
> #if PLATFORM(GTK)
> typedef GenericCallback<API::Error*> PrintFinishedCallback;
> #endif
>@@ -1319,11 +1315,10 @@ public:
> #endif
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>-    void insertAttachment(const String& identifier, const WebCore::AttachmentDisplayOptions&, const String& filename, std::optional<String> contentType, WebCore::SharedBuffer& data, Function<void(CallbackBase::Error)>&&);
>-    void requestAttachmentInfo(const String& identifier, Function<void(const WebCore::AttachmentInfo&, CallbackBase::Error)>&&);
>+    RefPtr<API::Attachment> attachmentForIdentifier(const String& identifier) const;
>+    void insertAttachment(Ref<API::Attachment>&&, const WebCore::AttachmentDisplayOptions&, uint64_t fileSize, const String& fileName, std::optional<String> contentType, Function<void(CallbackBase::Error)>&&);
>     void setAttachmentDisplayOptions(const String& identifier, WebCore::AttachmentDisplayOptions, Function<void(CallbackBase::Error)>&&);
>-    void setAttachmentDataAndContentType(const String& identifier, WebCore::SharedBuffer& data, std::optional<String>&& newContentType, std::optional<String>&& newFilename, Function<void(CallbackBase::Error)>&&);
>-    void attachmentInfoCallback(const WebCore::AttachmentInfo&, CallbackID);
>+    void updateAttachmentAttributes(const String& identifier, uint64_t fileSize, std::optional<String>&& newContentType, std::optional<String>&& newFilename, Function<void(CallbackBase::Error)>&&);
> #endif
> 
> #if ENABLE(APPLICATION_MANIFEST)
>@@ -1807,8 +1802,17 @@ private:
>     void stopAllURLSchemeTasks();
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>+    void registerAttachmentIdentifierFromData(const String& identifier, const String& contentType, const String& preferredFileName, const IPC::DataReference&);
>+    void registerAttachmentIdentifierFromFilePath(const String& identifier, const String& contentType, const String& filePath);
>+    void cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier);
>+
>+    void platformRegisterAttachment(Ref<API::Attachment>&&, const String& preferredFileName, const IPC::DataReference&);
>+    void platformRegisterAttachment(Ref<API::Attachment>&&, const String& filePath);
>+    void platformCloneAttachment(Ref<API::Attachment>&& fromAttachment, Ref<API::Attachment>&& toAttachment);
>+
>     void didInsertAttachment(const String& identifier, const String& source);
>     void didRemoveAttachment(const String& identifier);
>+    Ref<API::Attachment> ensureAttachment(const String& identifier);
> #endif
> 
> #if PLATFORM(MAC) && ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
>@@ -2208,6 +2212,10 @@ private:
> 
>     HashMap<String, Ref<WebURLSchemeHandler>> m_urlSchemeHandlersByScheme;
>     HashMap<uint64_t, Ref<WebURLSchemeHandler>> m_urlSchemeHandlersByIdentifier;
>+
>+#if ENABLE(ATTACHMENT_ELEMENT)
>+    HashMap<String, Ref<API::Attachment>> m_attachmentIdentifierToAttachmentMap;
>+#endif
>         
> #if PLATFORM(MAC) && ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
>     std::unique_ptr<DisplayLink> m_displayLink;
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.messages.in b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>index 68d6cb9b8a0e48add9fe7a76706ebadb52c0043b..1678f322b4e48975245654b259ebbca32d27e1a4 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.messages.in
>+++ b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>@@ -176,9 +176,6 @@ messages -> WebPageProxy {
>     EditingRangeCallback(struct WebKit::EditingRange range, WebKit::CallbackID callbackID)
>     UnsignedCallback(uint64_t result, WebKit::CallbackID callbackID)
>     RectForCharacterRangeCallback(WebCore::IntRect rect, struct WebKit::EditingRange actualRange, WebKit::CallbackID callbackID)
>-#if ENABLE(ATTACHMENT_ELEMENT)
>-    AttachmentInfoCallback(struct WebCore::AttachmentInfo info, WebKit::CallbackID callbackID);
>-#endif
> #if ENABLE(APPLICATION_MANIFEST)
>     ApplicationManifestCallback(std::optional<WebCore::ApplicationManifest> manifest, WebKit::CallbackID callbackID)
> #endif
>@@ -528,6 +525,9 @@ messages -> WebPageProxy {
> #endif
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>+    RegisterAttachmentIdentifierFromData(String identifier, String contentType, String preferredFileName, IPC::DataReference data)
>+    RegisterAttachmentIdentifierFromFilePath(String identifier, String contentType, String filePath)
>+    CloneAttachmentData(String fromIdentifier, String toIdentifier)
>     DidInsertAttachment(String identifier, String source)
>     DidRemoveAttachment(String identifier)
> #endif
>diff --git a/Source/WebKit/UIProcess/ios/PageClientImplIOS.h b/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>index 1c7abfc26c636d9480e3fddc7c6bea51332f26b9..415e669e81be65a3e9d4d07411e9753e7b5e9c43 100644
>--- a/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>+++ b/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>@@ -35,7 +35,7 @@ OBJC_CLASS WKContentView;
> OBJC_CLASS WKEditorUndoTargetObjC;
> 
> namespace WebCore {
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> }
> 
> namespace WebKit {
>diff --git a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>index f90a2f8a755d9b638244566ddd096270703e2115..017498eae20b0cabe061681452da23a397c275d3 100644
>--- a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>+++ b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>@@ -53,7 +53,7 @@
> #import "_WKDownloadInternal.h"
> #import <WebCore/NotImplemented.h>
> #import <WebCore/PlatformScreen.h>
>-#import <WebCore/PromisedBlobInfo.h>
>+#import <WebCore/PromisedAttachmentInfo.h>
> #import <WebCore/SharedBuffer.h>
> #import <WebCore/TextIndicator.h>
> #import <WebCore/ValidationBubble.h>
>diff --git a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>index cc45c5cff220d325765f0a0721e11b9985149469..a22830adff3c84b7b5ae4dde9fb3a412ba7622e5 100644
>--- a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>+++ b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>@@ -61,7 +61,7 @@ class Color;
> class FloatQuad;
> class IntSize;
> class SelectionRect;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> enum class RouteSharingPolicy;
> }
> 
>diff --git a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>index e829d450125f07c8523a739360a8016566a1f968..00960498d157865b563ec6a3264ac49de1daa16e 100644
>--- a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>+++ b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>@@ -80,7 +80,7 @@
> #import <WebCore/Pasteboard.h>
> #import <WebCore/Path.h>
> #import <WebCore/PathUtilities.h>
>-#import <WebCore/PromisedBlobInfo.h>
>+#import <WebCore/PromisedAttachmentInfo.h>
> #import <WebCore/RuntimeApplicationChecks.h>
> #import <WebCore/Scrollbar.h>
> #import <WebCore/TextIndicator.h>
>@@ -4873,8 +4873,8 @@ static BOOL shouldEnableDragInteractionForPolicy(_WKDragInteractionPolicy policy
> {
>     ASSERT(item.sourceAction != DragSourceActionNone);
> 
>-    if (item.promisedBlob)
>-        [self _prepareToDragPromisedBlob:item.promisedBlob];
>+    if (item.promisedAttachmentInfo)
>+        [self _prepareToDragPromisedAttachment:item.promisedAttachmentInfo];
> 
>     auto dragImage = adoptNS([[UIImage alloc] initWithCGImage:image.get() scale:_page->deviceScaleFactor() orientation:UIImageOrientationUp]);
>     _dragDropInteractionState.stageDragItem(item, dragImage.get());
>@@ -5075,7 +5075,7 @@ static NSArray<UIItemProvider *> *extractItemProvidersFromDropSession(id <UIDrop
>     [_editDropCaretView updateToPosition:[WKTextPosition textPositionWithRect:rect]];
> }
> 
>-- (void)_prepareToDragPromisedBlob:(const PromisedBlobInfo&)info
>+- (void)_prepareToDragPromisedAttachment:(const PromisedAttachmentInfo&)info
> {
>     auto session = retainPtr(_dragDropInteractionState.dragSession());
>     if (!session) {
>@@ -5086,7 +5086,7 @@ static NSArray<UIItemProvider *> *extractItemProvidersFromDropSession(id <UIDrop
>     auto numberOfAdditionalTypes = info.additionalTypes.size();
>     ASSERT(numberOfAdditionalTypes == info.additionalData.size());
> 
>-    RELEASE_LOG(DragAndDrop, "Drag session: %p preparing to drag blob: %s", session.get(), info.blobURL.string().utf8().data());
>+    RELEASE_LOG(DragAndDrop, "Drag session: %p preparing to drag blob: %s with attachment identifier: %s", session.get(), info.blobURL.string().utf8().data(), info.attachmentIdentifier.utf8().data());
> 
>     auto registrationList = adoptNS([[WebItemProviderRegistrationInfoList alloc] init]);
>     [registrationList setPreferredPresentationStyle:WebPreferredPresentationStyleAttachment];
>@@ -5099,7 +5099,7 @@ static NSArray<UIItemProvider *> *extractItemProvidersFromDropSession(id <UIDrop
>         }
>     }
> 
>-    [registrationList addPromisedType:info.contentType fileCallback:[session = WTFMove(session), weakSelf = WeakObjCPtr<WKContentView>(self), url = info.blobURL] (WebItemProviderFileCallback callback) {
>+    [registrationList addPromisedType:info.contentType fileCallback:[session = WTFMove(session), weakSelf = WeakObjCPtr<WKContentView>(self), info] (WebItemProviderFileCallback callback) {
>         auto strongSelf = weakSelf.get();
>         if (!strongSelf) {
>             callback(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorWebViewInvalidated userInfo:nil]);
>@@ -5109,13 +5109,24 @@ static NSArray<UIItemProvider *> *extractItemProvidersFromDropSession(id <UIDrop
>         NSString *temporaryBlobDirectory = FileSystem::createTemporaryDirectory(@"blobs");
>         NSURL *destinationURL = [NSURL fileURLWithPath:[temporaryBlobDirectory stringByAppendingPathComponent:[NSUUID UUID].UUIDString] isDirectory:NO];
> 
>-        RELEASE_LOG(DragAndDrop, "Drag session: %p delivering promised blob at path: %@", session.get(), destinationURL.path);
>-        strongSelf->_page->writeBlobToFilePath(url, destinationURL.path, [protectedURL = retainPtr(destinationURL), protectedCallback = makeBlockPtr(callback)] (bool success) {
>-            if (success)
>-                protectedCallback(protectedURL.get(), nil);
>+        auto attachment = strongSelf->_page->attachmentForIdentifier(info.attachmentIdentifier);
>+        if (attachment && attachment->fileWrapper()) {
>+            RELEASE_LOG(DragAndDrop, "Drag session: %p delivering promised attachment: %s at path: %@", session.get(), info.attachmentIdentifier.utf8().data(), destinationURL.path);
>+            NSError *fileWrapperError = nil;
>+            if ([attachment->fileWrapper() writeToURL:destinationURL options:0 originalContentsURL:nil error:&fileWrapperError])
>+                callback(destinationURL, nil);
>             else
>-                protectedCallback(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorUnknown userInfo:nil]);
>-        });
>+                callback(nil, fileWrapperError);
>+        } else if (!info.blobURL.isEmpty()) {
>+            RELEASE_LOG(DragAndDrop, "Drag session: %p delivering promised blob at path: %@", session.get(), destinationURL.path);
>+            strongSelf->_page->writeBlobToFilePath(info.blobURL, destinationURL.path, [protectedURL = retainPtr(destinationURL), protectedCallback = makeBlockPtr(callback)] (bool success) {
>+                if (success)
>+                    protectedCallback(protectedURL.get(), nil);
>+                else
>+                    protectedCallback(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorUnknown userInfo:nil]);
>+            });
>+        } else
>+            callback(nil, [NSError errorWithDomain:WKErrorDomain code:WKErrorWebViewInvalidated userInfo:nil]);
> 
>         [ensureLocalDragSessionContext(session.get()) addTemporaryDirectory:temporaryBlobDirectory];
>     }];
>diff --git a/Source/WebKit/UIProcess/mac/PageClientImplMac.h b/Source/WebKit/UIProcess/mac/PageClientImplMac.h
>index 972ca64ff7c75bcd84c173912ce06c6bd5f475a1..c884fa2bba9f8faec9766b22321e1f3ce5e85d13 100644
>--- a/Source/WebKit/UIProcess/mac/PageClientImplMac.h
>+++ b/Source/WebKit/UIProcess/mac/PageClientImplMac.h
>@@ -38,7 +38,7 @@
> namespace WebCore {
> class AlternativeTextUIController;
> struct DragItem;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> }
> 
> namespace WebKit {
>diff --git a/Source/WebKit/UIProcess/mac/PageClientImplMac.mm b/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
>index 3a5937934d8b8d064423e75166a66b58a0593446..0857f143488df67fdebe52bbf53a9fa8b3bb9b91 100644
>--- a/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
>+++ b/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
>@@ -70,7 +70,7 @@
> #import <WebCore/KeyboardEvent.h>
> #import <WebCore/NotImplemented.h>
> #import <WebCore/PlatformScreen.h>
>-#import <WebCore/PromisedBlobInfo.h>
>+#import <WebCore/PromisedAttachmentInfo.h>
> #import <WebCore/SharedBuffer.h>
> #import <WebCore/TextIndicator.h>
> #import <WebCore/TextIndicatorWindow.h>
>diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.cpp b/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.cpp
>index d87a5384cd7e0984b7814d590eb65956ff40b75a..ce7d889255384f83eeb05d71483bb4cdc7a44722 100644
>--- a/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.cpp
>+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.cpp
>@@ -160,6 +160,21 @@ bool WebEditorClient::shouldApplyStyle(StyleProperties* style, Range* range)
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
> 
>+void WebEditorClient::registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& preferredFileName, Ref<SharedBuffer>&& data)
>+{
>+    m_page->send(Messages::WebPageProxy::RegisterAttachmentIdentifierFromData(identifier, contentType, preferredFileName, IPC::SharedBufferDataReference { data.ptr() }));
>+}
>+
>+void WebEditorClient::registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& filePath)
>+{
>+    m_page->send(Messages::WebPageProxy::RegisterAttachmentIdentifierFromFilePath(identifier, contentType, filePath));
>+}
>+
>+void WebEditorClient::cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier)
>+{
>+    m_page->send(Messages::WebPageProxy::CloneAttachmentData(fromIdentifier, toIdentifier));
>+}
>+
> void WebEditorClient::didInsertAttachment(const String& identifier, const String& source)
> {
>     m_page->send(Messages::WebPageProxy::DidInsertAttachment(identifier, source));
>diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.h b/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.h
>index be66faf181a9cf0e8b646998efa44f039eac6493..fdb70ebd6070107a3d82b285a5463f8d74b02b7d 100644
>--- a/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.h
>+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebEditorClient.h
>@@ -60,8 +60,12 @@ private:
>     bool shouldMoveRangeAfterDelete(WebCore::Range*, WebCore::Range*) final;
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>+    void registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& preferredFileName, Ref<WebCore::SharedBuffer>&&) final;
>+    void registerAttachmentIdentifier(const String& identifier, const String& contentType, const String& filePath) final;
>+    void cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier) final;
>     void didInsertAttachment(const String& identifier, const String& source) final;
>     void didRemoveAttachment(const String& identifier) final;
>+    bool supportsClientSideAttachmentData() const final { return true; }
> #endif
> 
>     void didBeginEditing() final;
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>index 82fff4948d28c6a6c8b25568bc589508c9603a37..f28778a40bd874fadb70563897503879633eb5bb 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>@@ -185,7 +185,7 @@
> #include <WebCore/PlatformKeyboardEvent.h>
> #include <WebCore/PluginDocument.h>
> #include <WebCore/PrintContext.h>
>-#include <WebCore/PromisedBlobInfo.h>
>+#include <WebCore/PromisedAttachmentInfo.h>
> #include <WebCore/Range.h>
> #include <WebCore/RemoteDOMWindow.h>
> #include <WebCore/RemoteFrame.h>
>@@ -6067,36 +6067,23 @@ void WebPage::storageAccessResponse(bool wasGranted, uint64_t contextId)
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
> 
>-void WebPage::insertAttachment(const String& identifier, const AttachmentDisplayOptions& options, const String& filename, std::optional<String> contentType, const IPC::DataReference& data, CallbackID callbackID)
>+void WebPage::insertAttachment(const String& identifier, const AttachmentDisplayOptions& options, uint64_t fileSize, const String& fileName, std::optional<String> contentType, CallbackID callbackID)
> {
>     auto& frame = m_page->focusController().focusedOrMainFrame();
>-    frame.editor().insertAttachment(identifier, options, filename, SharedBuffer::create(data.data(), data.size()), contentType);
>+    frame.editor().insertAttachment(identifier, options, fileSize, fileName, WTFMove(contentType));
>     send(Messages::WebPageProxy::VoidCallback(callbackID));
> }
> 
>-void WebPage::requestAttachmentInfo(const String& identifier, CallbackID callbackID)
>-{
>-    auto attachment = attachmentElementWithIdentifier(identifier);
>-    if (!attachment) {
>-        send(Messages::WebPageProxy::AttachmentInfoCallback({ }, callbackID));
>-        return;
>-    }
>-
>-    attachment->requestInfo([callbackID, protectedThis = makeRef(*this), protectedAttachment = WTFMove(attachment)] (const AttachmentInfo& info) {
>-        protectedThis->send(Messages::WebPageProxy::AttachmentInfoCallback(info, callbackID));
>-    });
>-}
>-
> void WebPage::setAttachmentDisplayOptions(const String&, const AttachmentDisplayOptions&, CallbackID callbackID)
> {
>     send(Messages::WebPageProxy::VoidCallback(callbackID));
> }
> 
>-void WebPage::setAttachmentDataAndContentType(const String& identifier, const IPC::DataReference& data, std::optional<String> newContentType, std::optional<String> newFilename, CallbackID callbackID)
>+void WebPage::updateAttachmentAttributes(const String& identifier, uint64_t fileSize, std::optional<String> newContentType, std::optional<String> newFilename, CallbackID callbackID)
> {
>     if (auto attachment = attachmentElementWithIdentifier(identifier)) {
>         attachment->document().updateLayout();
>-        attachment->updateFileWithData(SharedBuffer::create(data.data(), data.size()), WTFMove(newContentType), WTFMove(newFilename));
>+        attachment->updateAttributes(fileSize, WTFMove(newContentType), WTFMove(newFilename));
>     }
>     send(Messages::WebPageProxy::VoidCallback(callbackID));
> }
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
>index 2b27cc882e25da7239de09a01ccb3eb8498bc63c..06e31e56bbbe12fb26f192d07cf09fec12d09c1d 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
>@@ -168,7 +168,7 @@ struct GlobalFrameIdentifier;
> struct GlobalWindowIdentifier;
> struct Highlight;
> struct KeypressCommand;
>-struct PromisedBlobInfo;
>+struct PromisedAttachmentInfo;
> struct TextCheckingResult;
> struct ViewportArguments;
> 
>@@ -1073,10 +1073,9 @@ public:
> #endif
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>-    void insertAttachment(const String& identifier, const WebCore::AttachmentDisplayOptions&, const String& filename, std::optional<String> contentType, const IPC::DataReference&, CallbackID);
>-    void requestAttachmentInfo(const String& identifier, CallbackID);
>+    void insertAttachment(const String& identifier, const WebCore::AttachmentDisplayOptions&, uint64_t fileSize, const String& fileName, std::optional<String> contentType, CallbackID);
>     void setAttachmentDisplayOptions(const String& identifier, const WebCore::AttachmentDisplayOptions&, CallbackID);
>-    void setAttachmentDataAndContentType(const String& identifier, const IPC::DataReference&, std::optional<String> newContentType, std::optional<String> newFilename, CallbackID);
>+    void updateAttachmentAttributes(const String& identifier, uint64_t fileSize, std::optional<String> newContentType, std::optional<String> newFilename, CallbackID);
> #endif
> 
> #if ENABLE(APPLICATION_MANIFEST)
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>index 64360768a30c621462ac55d4cb3ace90242878f5..59b2b751f12d6ec41d054c719270a09858be4686 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>@@ -509,10 +509,9 @@ messages -> WebPage LegacyReceiver {
> #endif
> 
> #if ENABLE(ATTACHMENT_ELEMENT)
>-    InsertAttachment(String identifier, struct WebCore::AttachmentDisplayOptions options, String filename, std::optional<String> contentType, IPC::DataReference data, WebKit::CallbackID callbackID)
>-    RequestAttachmentInfo(String identifier, WebKit::CallbackID callbackID)
>+    InsertAttachment(String identifier, struct WebCore::AttachmentDisplayOptions options, uint64_t fileSize, String fileName, std::optional<String> contentType, WebKit::CallbackID callbackID)
>     SetAttachmentDisplayOptions(String identifier, struct WebCore::AttachmentDisplayOptions options, WebKit::CallbackID callbackID)
>-    SetAttachmentDataAndContentType(String identifier, IPC::DataReference data, std::optional<String> newContentType, std::optional<String> newFilename, WebKit::CallbackID callbackID)
>+    UpdateAttachmentAttributes(String identifier, uint64_t fileSize, std::optional<String> newContentType, std::optional<String> newFilename, WebKit::CallbackID callbackID)
> #endif
> 
> #if ENABLE(APPLICATION_MANIFEST)
>diff --git a/Source/WebKitLegacy/win/WebCoreSupport/WebDragClient.cpp b/Source/WebKitLegacy/win/WebCoreSupport/WebDragClient.cpp
>index f60091faa45f47043b99f37de687c95dbc8a4599..1bc13526d60d2e4a81b63a8b75ddfdae724e21fa 100644
>--- a/Source/WebKitLegacy/win/WebCoreSupport/WebDragClient.cpp
>+++ b/Source/WebKitLegacy/win/WebCoreSupport/WebDragClient.cpp
>@@ -39,6 +39,7 @@
> #include <WebCore/Page.h>
> #include <WebCore/Pasteboard.h>
> #include <WebCore/PlatformMouseEvent.h>
>+#include <WebCore/SharedBuffer.h>
> #include <shlobj.h>
> 
> using namespace WebCore;
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index aef2524e482848c51c3ea5d2a777e6b5c1638509..3e2ffd3cf04f5432049dee47ef3c22a6726d9739 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,43 @@
>+2018-08-20  Wenson Hsieh  <wenson_hsieh@apple.com>
>+
>+        [Attachment Support] Augment _WKAttachment SPI to handle NSFileWrappers in addition to NSData
>+        https://bugs.webkit.org/show_bug.cgi?id=188496
>+        <rdar://problem/43216836>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Adjusts existing attachment API tests. See below for more detail.
>+
>+        * TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm:
>+        (-[TestWKWebView synchronouslyInsertAttachmentWithFileWrapper:contentType:]):
>+        (-[TestWKWebView synchronouslyInsertAttachmentWithFilename:contentType:data:]):
>+        (-[_WKAttachment synchronouslySetData:newContentType:newFilename:error:]):
>+        (-[_WKAttachment synchronouslySetFileWrapper:newContentType:error:]):
>+
>+        Move off of deprecated attachment SPI, and add new helper functions to synchronously insert a new attachment or
>+        update an existing attachment with a file wrapper.
>+
>+        (-[_WKAttachment expectRequestedDataToBe:]):
>+        (TestWebKitAPI::TEST):
>+
>+        Add a new test to verify that file-URL-backed NSFileWrappers can be used to insert and update attachment data.
>+        Also augment an existing test to check that an attachment element which has been copied and pasted within the
>+        same document has a different _WKAttachment wrapper object than its duplicate, but both _WKAttachments are
>+        backed by the same NSFileWrapper that was originally used to insert the attachment.
>+
>+        Additionally, add another macOS test to verify that dropping promised files in an attachment-element-enabled
>+        editable area inserts attachment elements into the document and notifies the UI client with the inserted
>+        attachment data.
>+
>+        (-[_WKAttachment synchronouslyRequestInfo:]): Deleted.
>+        (-[_WKAttachment synchronouslyRequestData:]): Deleted.
>+        * TestWebKitAPI/ios/DragAndDropSimulatorIOS.mm:
>+        (-[DragAndDropSimulator _webView:didInsertAttachment:withSource:]):
>+
>+        Move off of -_webView:didInsertAttachment:.
>+
>+        (-[DragAndDropSimulator _webView:didInsertAttachment:]): Deleted.
>+
> 2018-08-20  Claudio Saavedra  <csaavedra@igalia.com>
> 
>         Add WPE Debug configuration to the flakiness dashboard
>diff --git a/Tools/TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm b/Tools/TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm
>index 2f7c50369d1f2e9dd8f9803f88f1353c52a33948..20902d22276b344d3fa54afdd990441d70a79fe0 100644
>--- a/Tools/TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebKitCocoa/WKAttachmentTests.mm
>@@ -145,13 +145,17 @@ private:
> @interface TestWKWebView (AttachmentTesting)
> @end
> 
>+static NSString *attachmentEditingTestMarkup = @"<meta name='viewport' content='width=device-width, initial-scale=1'>"
>+    "<script>focus = () => document.body.focus()</script>"
>+    "<body onload=focus() contenteditable></body>";
>+
> static RetainPtr<TestWKWebView> webViewForTestingAttachments(CGSize webViewSize, WKWebViewConfiguration *configuration)
> {
>     configuration._attachmentElementEnabled = YES;
>     WKPreferencesSetCustomPasteboardDataEnabled((WKPreferencesRef)[configuration preferences], YES);
> 
>     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, webViewSize.width, webViewSize.height) configuration:configuration]);
>-    [webView synchronouslyLoadHTMLString:@"<meta name='viewport' content='width=device-width, initial-scale=1'><script>focus = () => document.body.focus()</script><body onload=focus() contenteditable></body>"];
>+    [webView synchronouslyLoadHTMLString:attachmentEditingTestMarkup];
> 
>     return webView;
> }
>@@ -237,10 +241,23 @@ static NSData *testPDFData()
>     return success;
> }
> 
>+- (_WKAttachment *)synchronouslyInsertAttachmentWithFileWrapper:(NSFileWrapper *)fileWrapper contentType:(NSString *)contentType
>+{
>+    __block bool done = false;
>+    RetainPtr<_WKAttachment> attachment = [self _insertAttachmentWithFileWrapper:fileWrapper contentType:contentType options:nil completion:^(BOOL) {
>+        done = true;
>+    }];
>+    TestWebKitAPI::Util::run(&done);
>+    return attachment.autorelease();
>+}
>+
> - (_WKAttachment *)synchronouslyInsertAttachmentWithFilename:(NSString *)filename contentType:(NSString *)contentType data:(NSData *)data
> {
>     __block bool done = false;
>-    RetainPtr<_WKAttachment> attachment = [self _insertAttachmentWithFilename:filename contentType:contentType data:data options:nil completion:^(BOOL) {
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:data]);
>+    if (filename)
>+        [fileWrapper setPreferredFilename:filename];
>+    RetainPtr<_WKAttachment> attachment = [self _insertAttachmentWithFileWrapper:fileWrapper.get() contentType:contentType options:nil completion:^(BOOL) {
>         done = true;
>     }];
>     TestWebKitAPI::Util::run(&done);
>@@ -312,13 +329,12 @@ static NSData *testPDFData()
>         *error = resultError.autorelease();
> }
> 
>-- (_WKAttachmentInfo *)synchronouslyRequestInfo:(NSError **)error
>+- (void)synchronouslySetFileWrapper:(NSFileWrapper *)fileWrapper newContentType:(NSString *)newContentType error:(NSError **)error
> {
>-    __block RetainPtr<_WKAttachmentInfo> result;
>     __block RetainPtr<NSError> resultError;
>     __block bool done = false;
>-    [self requestInfo:^(_WKAttachmentInfo *info, NSError *error) {
>-        result = info;
>+
>+    [self setFileWrapper:fileWrapper contentType:newContentType completion:^(NSError *error) {
>         resultError = error;
>         done = true;
>     }];
>@@ -327,20 +343,17 @@ static NSData *testPDFData()
> 
>     if (error)
>         *error = resultError.autorelease();
>-
>-    return result.autorelease();
>-}
>-
>-- (NSData *)synchronouslyRequestData:(NSError **)error
>-{
>-    return [self synchronouslyRequestInfo:error].data;
> }
> 
> - (void)synchronouslySetData:(NSData *)data newContentType:(NSString *)newContentType newFilename:(NSString *)newFilename error:(NSError **)error
> {
>     __block RetainPtr<NSError> resultError;
>     __block bool done = false;
>-    [self setData:data newContentType:newContentType newFilename:newFilename completion:^(NSError *error) {
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:data]);
>+    if (newFilename)
>+        [fileWrapper setPreferredFilename:newFilename];
>+
>+    [self setFileWrapper:fileWrapper.get() contentType:newContentType completion:^(NSError *error) {
>         resultError = error;
>         done = true;
>     }];
>@@ -354,9 +367,9 @@ static NSData *testPDFData()
> - (void)expectRequestedDataToBe:(NSData *)expectedData
> {
>     NSError *requestError = nil;
>-    _WKAttachmentInfo *info = [self synchronouslyRequestInfo:&requestError];
>+    _WKAttachmentInfo *info = self.info;
> 
>-    BOOL observedDataIsEqualToExpectedData = [info.data isEqualToData:expectedData] || info.data == expectedData;
>+    BOOL observedDataIsEqualToExpectedData = info.data == expectedData || [info.data isEqualToData:expectedData];
>     EXPECT_TRUE(observedDataIsEqualToExpectedData);
>     if (!observedDataIsEqualToExpectedData) {
>         NSLog(@"Expected data: %@ but observed: %@ for %@", [expectedData shortDescription], [info.data shortDescription], self);
>@@ -499,7 +512,7 @@ TEST(WKAttachmentTests, AttachmentElementInsertion)
>         observer.expectAttachmentUpdates(@[ ], @[ firstAttachment.get() ]);
>     }
> 
>-    _WKAttachmentInfo *info = [firstAttachment synchronouslyRequestInfo:nil];
>+    _WKAttachmentInfo *info = [firstAttachment info];
>     EXPECT_TRUE([info.data isEqualToData:testHTMLData()]);
>     EXPECT_TRUE([info.contentType isEqualToString:@"text/html"]);
>     EXPECT_TRUE([info.name isEqualToString:@"foo"]);
>@@ -516,7 +529,7 @@ TEST(WKAttachmentTests, AttachmentElementInsertion)
>         scope.expectAttachmentUpdates(@[ firstAttachment.get() ], @[ secondAttachment.get() ]);
>     }
> 
>-    [firstAttachment expectRequestedDataToBe:nil];
>+    [firstAttachment expectRequestedDataToBe:testHTMLData()];
>     [secondAttachment expectRequestedDataToBe:testImageData()];
>     EXPECT_FALSE([webView hasAttribute:@"webkitattachmentbloburl" forQuerySelector:@"attachment"]);
>     EXPECT_FALSE([webView hasAttribute:@"webkitattachmentpath" forQuerySelector:@"attachment"]);
>@@ -539,14 +552,14 @@ TEST(WKAttachmentTests, AttachmentUpdatesWhenInsertingAndDeletingNewline)
> 
>     [webView expectUpdatesAfterCommand:@"DeleteBackward" withArgument:nil expectedRemovals:@[] expectedInsertions:@[]];
> 
>-    _WKAttachmentInfo *info = [attachment synchronouslyRequestInfo:nil];
>+    _WKAttachmentInfo *info = [attachment info];
>     EXPECT_TRUE([info.data isEqualToData:testHTMLData()]);
>     EXPECT_TRUE([info.contentType isEqualToString:@"text/plain"]);
>     EXPECT_TRUE([info.name isEqualToString:@"foo.txt"]);
>     EXPECT_EQ(info.filePath.length, 0U);
> 
>     [webView expectUpdatesAfterCommand:@"DeleteForward" withArgument:nil expectedRemovals:@[attachment.get()] expectedInsertions:@[]];
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:testHTMLData()];
> }
> 
> TEST(WKAttachmentTests, AttachmentUpdatesWhenUndoingAndRedoing)
>@@ -560,19 +573,19 @@ TEST(WKAttachmentTests, AttachmentUpdatesWhenUndoingAndRedoing)
>         observer.expectAttachmentUpdates(@[ ], @[attachment.get()]);
>     }
>     [webView expectUpdatesAfterCommand:@"Undo" withArgument:nil expectedRemovals:@[attachment.get()] expectedInsertions:@[]];
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:htmlData.get()];
> 
>     [webView expectUpdatesAfterCommand:@"Redo" withArgument:nil expectedRemovals:@[] expectedInsertions:@[attachment.get()]];
>     [attachment expectRequestedDataToBe:htmlData.get()];
> 
>     [webView expectUpdatesAfterCommand:@"DeleteBackward" withArgument:nil expectedRemovals:@[attachment.get()] expectedInsertions:@[]];
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:htmlData.get()];
> 
>     [webView expectUpdatesAfterCommand:@"Undo" withArgument:nil expectedRemovals:@[] expectedInsertions:@[attachment.get()]];
>     [attachment expectRequestedDataToBe:htmlData.get()];
> 
>     [webView expectUpdatesAfterCommand:@"Redo" withArgument:nil expectedRemovals:@[attachment.get()] expectedInsertions:@[]];
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:htmlData.get()];
> }
> 
> TEST(WKAttachmentTests, AttachmentUpdatesWhenChangingFontStyles)
>@@ -597,7 +610,7 @@ TEST(WKAttachmentTests, AttachmentUpdatesWhenChangingFontStyles)
> 
>     // Inserting text should delete the current selection, removing the attachment in the process.
>     [webView expectUpdatesAfterCommand:@"InsertText" withArgument:@"foo" expectedRemovals:@[attachment.get()] expectedInsertions:@[]];
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:testHTMLData()];
> }
> 
> TEST(WKAttachmentTests, AttachmentUpdatesWhenInsertingLists)
>@@ -661,7 +674,7 @@ TEST(WKAttachmentTests, AttachmentUpdatesWhenCuttingAndPasting)
>         [webView _synchronouslyExecuteEditCommand:@"Cut" argument:nil];
>         observer.expectAttachmentUpdates(@[attachment.get()], @[]);
>     }
>-    [attachment expectRequestedDataToBe:nil];
>+    [attachment expectRequestedDataToBe:testHTMLData()];
>     {
>         ObserveAttachmentUpdatesForScope observer(webView.get());
>         [webView _synchronouslyExecuteEditCommand:@"Paste" argument:nil];
>@@ -689,36 +702,7 @@ TEST(WKAttachmentTests, AttachmentDataForEmptyFile)
>         [webView _synchronouslyExecuteEditCommand:@"DeleteBackward" argument:nil];
>         scope.expectAttachmentUpdates(@[attachment.get()], @[]);
>     }
>-    [attachment expectRequestedDataToBe:nil];
>-}
>-
>-TEST(WKAttachmentTests, MultipleSimultaneousAttachmentDataRequests)
>-{
>-    auto webView = webViewForTestingAttachments();
>-    RetainPtr<NSData> htmlData = testHTMLData();
>-    RetainPtr<_WKAttachment> attachment;
>-    {
>-        ObserveAttachmentUpdatesForScope observer(webView.get());
>-        attachment = [webView synchronouslyInsertAttachmentWithFilename:@"foo.txt" contentType:@"text/plain" data:htmlData.get()];
>-        observer.expectAttachmentUpdates(@[], @[attachment.get()]);
>-    }
>-    __block RetainPtr<NSData> dataForFirstRequest;
>-    __block RetainPtr<NSData> dataForSecondRequest;
>-    __block bool done = false;
>-    [attachment requestInfo:^(_WKAttachmentInfo *info, NSError *error) {
>-        EXPECT_TRUE(!error);
>-        dataForFirstRequest = info.data;
>-    }];
>-    [attachment requestInfo:^(_WKAttachmentInfo *info, NSError *error) {
>-        EXPECT_TRUE(!error);
>-        dataForSecondRequest = info.data;
>-        done = true;
>-    }];
>-
>-    Util::run(&done);
>-
>-    EXPECT_TRUE([dataForFirstRequest isEqualToData:htmlData.get()]);
>-    EXPECT_TRUE([dataForSecondRequest isEqualToData:htmlData.get()]);
>+    [attachment expectRequestedDataToBe:[NSData data]];
> }
> 
> TEST(WKAttachmentTests, ChangeAttachmentDataAndFileInformation)
>@@ -779,7 +763,7 @@ TEST(WKAttachmentTests, InsertPastedImageAsAttachment)
>         attachment = observer.observer().inserted[0];
>     }
> 
>-    auto size = platformImageWithData([attachment synchronouslyRequestData:nil]).size;
>+    auto size = platformImageWithData([attachment info].data).size;
>     EXPECT_EQ(215., size.width);
>     EXPECT_EQ(174., size.height);
>     EXPECT_WK_STREQ([attachment uniqueIdentifier], [webView stringByEvaluatingJavaScript:@"document.querySelector('attachment').uniqueIdentifier"]);
>@@ -833,7 +817,7 @@ TEST(WKAttachmentTests, InsertPastedAttributedStringContainingMultipleAttachment
>         EXPECT_EQ(0U, observer.observer().removed.count);
>         EXPECT_EQ(3U, observer.observer().inserted.count);
>         for (_WKAttachment *attachment in observer.observer().inserted) {
>-            NSData *data = [attachment synchronouslyRequestData:nil];
>+            NSData *data = attachment.info.data;
>             if ([data isEqualToData:testZIPData()])
>                 zipAttachment = attachment;
>             else if ([data isEqualToData:testPDFData()])
>@@ -894,11 +878,12 @@ TEST(WKAttachmentTests, InsertAndRemoveDuplicateAttachment)
> {
>     auto webView = webViewForTestingAttachments();
>     RetainPtr<NSData> data = testHTMLData();
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:data.get()]);
>     RetainPtr<_WKAttachment> originalAttachment;
>     RetainPtr<_WKAttachment> pastedAttachment;
>     {
>         ObserveAttachmentUpdatesForScope observer(webView.get());
>-        originalAttachment = [webView synchronouslyInsertAttachmentWithFilename:@"foo.txt" contentType:@"text/plain" data:data.get()];
>+        originalAttachment = [webView synchronouslyInsertAttachmentWithFileWrapper:fileWrapper.get() contentType:@"text/plain"];
>         EXPECT_EQ(0U, observer.observer().removed.count);
>         observer.expectAttachmentUpdates(@[], @[originalAttachment.get()]);
>     }
>@@ -924,17 +909,22 @@ TEST(WKAttachmentTests, InsertAndRemoveDuplicateAttachment)
>         [webView _synchronouslyExecuteEditCommand:@"DeleteBackward" argument:nil];
>         observer.expectAttachmentUpdates(@[originalAttachment.get()], @[]);
>     }
>+
>+    EXPECT_FALSE([originalAttachment isEqual:pastedAttachment.get()]);
>+    EXPECT_TRUE([[originalAttachment info].fileWrapper isEqual:[pastedAttachment info].fileWrapper]);
>+    EXPECT_TRUE([[originalAttachment info].fileWrapper isEqual:fileWrapper.get()]);
> }
> 
> TEST(WKAttachmentTests, InsertDuplicateAttachmentAndUpdateData)
> {
>     auto webView = webViewForTestingAttachments();
>-    RetainPtr<NSData> originalData = testHTMLData();
>+    auto originalData = retainPtr(testHTMLData());
>+    auto fileWrapper = adoptNS([[NSFileWrapper alloc] initRegularFileWithContents:originalData.get()]);
>     RetainPtr<_WKAttachment> originalAttachment;
>     RetainPtr<_WKAttachment> pastedAttachment;
>     {
>         ObserveAttachmentUpdatesForScope observer(webView.get());
>-        originalAttachment = [webView synchronouslyInsertAttachmentWithFilename:@"foo.txt" contentType:@"text/plain" data:originalData.get()];
>+        originalAttachment = [webView synchronouslyInsertAttachmentWithFileWrapper:fileWrapper.get() contentType:@"text/plain"];
>         EXPECT_EQ(0U, observer.observer().removed.count);
>         observer.expectAttachmentUpdates(@[], @[originalAttachment.get()]);
>     }
>@@ -953,6 +943,10 @@ TEST(WKAttachmentTests, InsertDuplicateAttachmentAndUpdateData)
>     [originalAttachment synchronouslySetData:updatedData.get() newContentType:nil newFilename:nil error:nil];
>     [originalAttachment expectRequestedDataToBe:updatedData.get()];
>     [pastedAttachment expectRequestedDataToBe:originalData.get()];
>+
>+    EXPECT_FALSE([originalAttachment isEqual:pastedAttachment.get()]);
>+    EXPECT_FALSE([[originalAttachment info].fileWrapper isEqual:[pastedAttachment info].fileWrapper]);
>+    EXPECT_FALSE([[originalAttachment info].fileWrapper isEqual:fileWrapper.get()]);
> }
> 
> TEST(WKAttachmentTests, InjectedBundleReplaceURLsWhenPastingAttributedString)
>@@ -987,6 +981,37 @@ TEST(WKAttachmentTests, InjectedBundleReplaceURLWhenPastingImage)
>     EXPECT_WK_STREQ("cid:foo-bar", [webView valueOfAttribute:@"src" forQuerySelector:@"img"]);
> }
> 
>+TEST(WKAttachmentTests, InsertAttachmentUsingFileWrapperWithFilePath)
>+{
>+    auto webView = webViewForTestingAttachments();
>+    auto originalFileWrapper = adoptNS([[NSFileWrapper alloc] initWithURL:testImageFileURL() options:0 error:nil]);
>+    RetainPtr<_WKAttachment> attachment;
>+    {
>+        ObserveAttachmentUpdatesForScope observer(webView.get());
>+        attachment = [webView synchronouslyInsertAttachmentWithFileWrapper:originalFileWrapper.get() contentType:nil];
>+        observer.expectAttachmentUpdates(@[ ], @[ attachment.get() ]);
>+    }
>+
>+    _WKAttachmentInfo *infoBeforeUpdate = [attachment info];
>+    EXPECT_WK_STREQ("image/png", infoBeforeUpdate.contentType);
>+    EXPECT_WK_STREQ("icon.png", infoBeforeUpdate.name);
>+    EXPECT_TRUE([originalFileWrapper isEqual:infoBeforeUpdate.fileWrapper]);
>+    [attachment expectRequestedDataToBe:testImageData()];
>+
>+    auto newFileWrapper = adoptNS([[NSFileWrapper alloc] initWithURL:testPDFFileURL() options:0 error:nil]);
>+    {
>+        ObserveAttachmentUpdatesForScope observer(webView.get());
>+        [attachment synchronouslySetFileWrapper:newFileWrapper.get() newContentType:nil error:nil];
>+        observer.expectAttachmentUpdates(@[ ], @[ ]);
>+    }
>+
>+    _WKAttachmentInfo *infoAfterUpdate = [attachment info];
>+    EXPECT_WK_STREQ("application/pdf", infoAfterUpdate.contentType);
>+    EXPECT_WK_STREQ("test.pdf", infoAfterUpdate.name);
>+    EXPECT_TRUE([newFileWrapper isEqual:infoAfterUpdate.fileWrapper]);
>+    [attachment expectRequestedDataToBe:testPDFData()];
>+}
>+
> #pragma mark - Platform-specific tests
> 
> #if PLATFORM(MAC)
>@@ -1008,17 +1033,15 @@ TEST(WKAttachmentTestsMac, InsertPastedFileURLsAsAttachments)
>     }
> 
>     NSArray<NSData *> *expectedAttachmentData = @[ testPDFData(), testImageData() ];
>-    EXPECT_TRUE([expectedAttachmentData containsObject:[[insertedAttachments firstObject] synchronouslyRequestData:nil]]);
>-    EXPECT_TRUE([expectedAttachmentData containsObject:[[insertedAttachments lastObject] synchronouslyRequestData:nil]]);
>+    EXPECT_TRUE([expectedAttachmentData containsObject:[insertedAttachments firstObject].info.data]);
>+    EXPECT_TRUE([expectedAttachmentData containsObject:[insertedAttachments lastObject].info.data]);
>     EXPECT_WK_STREQ("application/pdf", [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment')[0].getAttribute('type')"]);
>     EXPECT_WK_STREQ("test.pdf", [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment')[0].getAttribute('title')"]);
>     EXPECT_WK_STREQ("image/png", [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment')[1].getAttribute('type')"]);
>     EXPECT_WK_STREQ("icon.png", [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment')[1].getAttribute('title')"]);
> 
>-    for (_WKAttachment *attachment in insertedAttachments.get()) {
>-        _WKAttachmentInfo *info = [attachment synchronouslyRequestInfo:nil];
>-        EXPECT_GT(info.filePath.length, 0U);
>-    }
>+    for (_WKAttachment *attachment in insertedAttachments.get())
>+        EXPECT_GT(attachment.info.filePath.length, 0U);
> 
>     {
>         ObserveAttachmentUpdatesForScope observer(webView.get());
>@@ -1027,8 +1050,42 @@ TEST(WKAttachmentTestsMac, InsertPastedFileURLsAsAttachments)
>         NSArray<_WKAttachment *> *removedAttachments = [observer.observer() removed];
>         EXPECT_EQ(2U, removedAttachments.count);
>         EXPECT_TRUE([removedAttachments containsObject:[insertedAttachments firstObject]]);
>-        EXPECT_TRUE([removedAttachments.lastObject isEqual:[insertedAttachments lastObject]]);
>+        EXPECT_TRUE([removedAttachments containsObject:[insertedAttachments lastObject]]);
>+    }
>+}
>+
>+TEST(WKAttachmentTestsMac, InsertDroppedFilePromisesAsAttachments)
>+{
>+    auto configuration = adoptNS([[WKWebViewConfiguration alloc] init]);
>+    [configuration _setAttachmentElementEnabled:YES];
>+    auto simulator = adoptNS([[DragAndDropSimulator alloc] initWithWebViewFrame:NSMakeRect(0, 0, 400, 400) configuration:configuration.get()]);
>+    TestWKWebView *webView = [simulator webView];
>+    [webView synchronouslyLoadHTMLString:attachmentEditingTestMarkup];
>+    [simulator writePromisedFiles:@[ testPDFFileURL(), testImageFileURL() ]];
>+
>+    ObserveAttachmentUpdatesForScope observer(webView);
>+    [simulator runFrom:CGPointMake(0, 0) to:CGPointMake(50, 50)];
>+    auto insertedAttachments = retainPtr([observer.observer() inserted]);
>+    EXPECT_EQ(2U, [insertedAttachments count]);
>+    EXPECT_EQ(2, [[webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment').length"] intValue]);
>+
>+    NSArray<NSData *> *expectedData = @[ testPDFData(), testImageData() ];
>+    for (_WKAttachment *attachment in insertedAttachments.get()) {
>+        EXPECT_GT(attachment.info.filePath.length, 0U);
>+        EXPECT_TRUE([expectedData containsObject:attachment.info.data]);
>+        if ([testPDFData() isEqualToData:attachment.info.data])
>+            EXPECT_WK_STREQ("application/pdf", attachment.info.contentType);
>+        else if ([testImageData() isEqualToData:attachment.info.data])
>+            EXPECT_WK_STREQ("image/png", attachment.info.contentType);
>     }
>+
>+    [webView _synchronouslyExecuteEditCommand:@"SelectAll" argument:nil];
>+    [webView _synchronouslyExecuteEditCommand:@"DeleteBackward" argument:nil];
>+    NSArray<_WKAttachment *> *removedAttachments = [observer.observer() removed];
>+    EXPECT_EQ(2U, removedAttachments.count);
>+    EXPECT_EQ(0, [[webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment').length"] intValue]);
>+    EXPECT_TRUE([removedAttachments containsObject:[insertedAttachments firstObject]]);
>+    EXPECT_TRUE([removedAttachments containsObject:[insertedAttachments lastObject]]);
> }
> 
> #endif // PLATFORM(MAC)
>@@ -1073,7 +1130,7 @@ TEST(WKAttachmentTestsIOS, InsertDroppedAttributedStringContainingAttachment)
>     EXPECT_EQ(0U, [dragAndDropSimulator removedAttachments].count);
>     auto attachment = retainPtr([dragAndDropSimulator insertedAttachments].firstObject);
> 
>-    auto size = platformImageWithData([attachment synchronouslyRequestData:nil]).size;
>+    auto size = platformImageWithData([attachment info].data).size;
>     EXPECT_EQ(215., size.width);
>     EXPECT_EQ(174., size.height);
>     EXPECT_WK_STREQ("image/png", [webView valueOfAttribute:@"type" forQuerySelector:@"attachment"]);
>@@ -1111,13 +1168,8 @@ TEST(WKAttachmentTestsIOS, InsertDroppedRichAndPlainTextFilesAsAttachments)
>     EXPECT_EQ(2U, [dragAndDropSimulator insertedAttachments].count);
>     EXPECT_EQ(0U, [dragAndDropSimulator removedAttachments].count);
> 
>-    for (_WKAttachment *attachment in [dragAndDropSimulator insertedAttachments]) {
>-        NSError *error = nil;
>-        EXPECT_GT([attachment synchronouslyRequestData:&error].length, 0U);
>-        EXPECT_TRUE(!error);
>-        if (error)
>-            NSLog(@"Error: %@", error);
>-    }
>+    for (_WKAttachment *attachment in [dragAndDropSimulator insertedAttachments])
>+        EXPECT_GT([attachment info].data.length, 0U);
> 
>     EXPECT_EQ(2, [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment').length"].intValue);
>     EXPECT_WK_STREQ("hello.rtf", [webView stringByEvaluatingJavaScript:@"document.querySelectorAll('attachment')[0].getAttribute('title')"]);
>@@ -1174,13 +1226,8 @@ TEST(WKAttachmentTestsIOS, InsertDroppedItemProvidersInOrder)
>     EXPECT_EQ(2U, [dragAndDropSimulator insertedAttachments].count);
>     EXPECT_EQ(0U, [dragAndDropSimulator removedAttachments].count);
> 
>-    for (_WKAttachment *attachment in [dragAndDropSimulator insertedAttachments]) {
>-        NSError *error = nil;
>-        EXPECT_GT([attachment synchronouslyRequestData:&error].length, 0U);
>-        EXPECT_TRUE(!error);
>-        if (error)
>-            NSLog(@"Error: %@", error);
>-    }
>+    for (_WKAttachment *attachment in [dragAndDropSimulator insertedAttachments])
>+        EXPECT_GT([attachment info].data.length, 0U);
> 
>     [webView expectElementTagsInOrder:@[ @"ATTACHMENT", @"A", @"ATTACHMENT" ]];
> 
>diff --git a/Tools/TestWebKitAPI/ios/DragAndDropSimulatorIOS.mm b/Tools/TestWebKitAPI/ios/DragAndDropSimulatorIOS.mm
>index 9e1f21ee1d53bdd46c333810210ed070df132c8a..0f97a39db60ab2902a58834145a7409b231b57e6 100644
>--- a/Tools/TestWebKitAPI/ios/DragAndDropSimulatorIOS.mm
>+++ b/Tools/TestWebKitAPI/ios/DragAndDropSimulatorIOS.mm
>@@ -680,7 +680,7 @@ static NSArray *dragAndDropEventNames()
>     return self.overridePerformDropBlock ? self.overridePerformDropBlock(session) : session.items;
> }
> 
>-- (void)_webView:(WKWebView *)webView didInsertAttachment:(_WKAttachment *)attachment
>+- (void)_webView:(WKWebView *)webView didInsertAttachment:(_WKAttachment *)attachment withSource:(NSString *)source
> {
>     [_insertedAttachments addObject:attachment];
> }

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Attachments on bug 188496: 347345 | 347346 | 347350 | 347353 | 347361 | 347499 | 347505 | 347506 | 347517 | 347522 | 347529 | 347600