Attachment 371183 Details for Bug 197457 – Patch

[patch] Patch

bug-197457-20190603171105.patch (text/plain), 19.93 KB, created by cathiechen on 2019-06-03 02:11:08 PDT

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Creator: cathiechen

Created: 2019-06-03 02:11:08 PDT

Size: 19.93 KB

patch

obsolete

>Subversion Revision: 245788
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index bb6aacac69a440eed3d117098bb1f977589fe5b7..1aefc2c1d50e38b1cac80972e411d8396a2ee8fa 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,33 @@
>+2019-05-27  Cathie Chen  <cathiechen@igalia.com>
>+
>+        JS wrapper of target in ResizeObserverEntry/ResizeObserver shouldn't get collected ahead
>+        https://bugs.webkit.org/show_bug.cgi?id=197457
>+
>+        Reviewed by Ryosuke Niwa.
>+
>+        Add JSCustomMarkFunction to make sure JS wrappers wouldn't be collected when JSResizeObserverEntry live.
>+
>+        For ResizeObserver, if targets are removed, it will get fired for the last time. We also need to keep these JS
>+        wrappers live. So add these targets to a GCReachableRef list once they're observed.
>+
>+        Add element-leak.html to test the targets with `entry.target.myEntry = entry` could be released properly.
>+
>+        Tests: resize-observer/element-leak.html
>+               resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive.html
>+               resize-observer/resize-observer-keeps-js-wrapper-of-target-alive.html
>+
>+        * Sources.txt:
>+        * WebCore.xcodeproj/project.pbxproj:
>+        * bindings/js/JSResizeObserverEntryCustom.cpp: Added.
>+        (WebCore::JSResizeObserverEntry::visitAdditionalChildren):
>+        * page/ResizeObserver.cpp:
>+        (WebCore::ResizeObserver::observe):
>+        (WebCore::ResizeObserver::removeAllTargets):
>+        (WebCore::ResizeObserver::removeObservation):
>+        (WebCore::ResizeObserver::stop):
>+        * page/ResizeObserver.h:
>+        * page/ResizeObserverEntry.idl:
>+
> 2019-05-27  Carlos Garcia Campos  <cgarcia@igalia.com>
> 
>         Touch support is reported even when the device doesn't have a touch screen
>diff --git a/Source/WebCore/Sources.txt b/Source/WebCore/Sources.txt
>index 2e2cfd14109813ab510017a122c1faf00201f33d..176b48e9df8b48b44865390dfa28a9bb5b3728d7 100644
>--- a/Source/WebCore/Sources.txt
>+++ b/Source/WebCore/Sources.txt
>@@ -532,6 +532,7 @@ bindings/js/JSPromiseRejectionEventCustom.cpp
> bindings/js/JSReadableStreamSourceCustom.cpp
> bindings/js/JSRemoteDOMWindowBase.cpp
> bindings/js/JSRemoteDOMWindowCustom.cpp
>+bindings/js/JSResizeObserverEntryCustom.cpp
> bindings/js/JSSVGPathSegCustom.cpp
> bindings/js/JSSVGViewSpecCustom.cpp
> bindings/js/JSStyleSheetCustom.cpp
>diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>index e95a8f930e4c38159c12ad63d3abf9aa3cf704b4..d8e867097c95f85bcc63213b705f2e6c4e297e12 100644
>--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>@@ -8782,6 +8782,7 @@
> 		585D6DFB1A15355600FA4F12 /* SimpleLineLayoutResolver.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SimpleLineLayoutResolver.cpp; sourceTree = "<group>"; };
> 		585D6E011A1A792E00FA4F12 /* SimpleLineLayoutFlowContents.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = SimpleLineLayoutFlowContents.cpp; sourceTree = "<group>"; };
> 		585D6E021A1A792E00FA4F12 /* SimpleLineLayoutFlowContents.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SimpleLineLayoutFlowContents.h; sourceTree = "<group>"; };
>+		5884FE5622813E2D0040AFF6 /* JSResizeObserverEntryCustom.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSResizeObserverEntryCustom.cpp; sourceTree = "<group>"; };
> 		589556EC18D4A44000764B03 /* BorderEdge.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BorderEdge.h; sourceTree = "<group>"; };
> 		58AEE2F318D4BCCF0022E7FE /* BorderEdge.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = BorderEdge.cpp; sourceTree = "<group>"; };
> 		58B2F9EA2232D43B00938D63 /* ResizeObserverEntry.idl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = ResizeObserverEntry.idl; sourceTree = "<group>"; };
>@@ -20672,6 +20673,7 @@
> 				CB38FD551CD21D5B00592A3F /* JSPerformanceEntryCustom.cpp */,
> 				833CF70F20DB3F5F00141BCC /* JSPerformanceObserverCustom.cpp */,
> 				A4A69B8BB91B49D0A804C31D /* JSPromiseRejectionEventCustom.cpp */,
>+				5884FE5622813E2D0040AFF6 /* JSResizeObserverEntryCustom.cpp */,
> 				83F572941FA1066F003837BE /* JSServiceWorkerClientCustom.cpp */,
> 				460D19441FCE21DD00C3DB85 /* JSServiceWorkerGlobalScopeCustom.cpp */,
> 				BC98A27C0C0C9950004BEBF7 /* JSStyleSheetCustom.cpp */,
>diff --git a/Source/WebCore/bindings/js/JSResizeObserverEntryCustom.cpp b/Source/WebCore/bindings/js/JSResizeObserverEntryCustom.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..6b2a4c2d34127cdc6e51d9431d2e90252f8b2e69
>--- /dev/null
>+++ b/Source/WebCore/bindings/js/JSResizeObserverEntryCustom.cpp
>@@ -0,0 +1,39 @@
>+/*
>+ * Copyright (C) 2019 Igalia S.L.
>+ *
>+ * 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.
>+ */
>+
>+#include "config.h"
>+#include "JSResizeObserverEntry.h"
>+
>+#include "JSNodeCustom.h"
>+
>+namespace WebCore {
>+
>+void JSResizeObserverEntry::visitAdditionalChildren(JSC::SlotVisitor& visitor)
>+{
>+    visitor.addOpaqueRoot(root(wrapped().target()));
>+    visitor.addOpaqueRoot(wrapped().contentRect());
>+}
>+
>+}
>diff --git a/Source/WebCore/page/ResizeObserver.cpp b/Source/WebCore/page/ResizeObserver.cpp
>index 9ff2b6ebc455462e436166f9d35367ea7fde8d7a..b9bd9bd9665c28da60dbe6461c0f03f5ae5ee5a4 100644
>--- a/Source/WebCore/page/ResizeObserver.cpp
>+++ b/Source/WebCore/page/ResizeObserver.cpp
>@@ -69,6 +69,7 @@ void ResizeObserver::observe(Element& target)
>     observerData.observers.append(makeWeakPtr(this));
> 
>     m_observations.append(ResizeObservation::create(&target));
>+    m_pendingTargets.append(target);
> 
>     if (m_document) {
>         m_document->addResizeObserver(*this);
>@@ -140,11 +141,17 @@ void ResizeObserver::removeAllTargets()
>         bool removed = removeTarget(*observation->target());
>         ASSERT_UNUSED(removed, removed);
>     }
>+    m_pendingTargets.clear();
>+    m_activeObservations.clear();
>     m_observations.clear();
> }
> 
> bool ResizeObserver::removeObservation(const Element& target)
> {
>+    m_pendingTargets.removeFirstMatching([&target](auto& pendingTarget) {
>+        return pendingTarget.ptr() == &target;
>+    });
>+
>     m_activeObservations.removeFirstMatching([&target](auto& observation) {
>         return observation->target() == &target;
>     });
>@@ -173,8 +180,6 @@ void ResizeObserver::stop()
> {
>     disconnect();
>     m_callback = nullptr;
>-    m_observations.clear();
>-    m_activeObservations.clear();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/page/ResizeObserver.h b/Source/WebCore/page/ResizeObserver.h
>index a1819609f6e0c3ee55bcdca3ac221fcaaa86b6e6..95b1c8b5be83d89b24979eaed9b9d4e90d3f4f87 100644
>--- a/Source/WebCore/page/ResizeObserver.h
>+++ b/Source/WebCore/page/ResizeObserver.h
>@@ -28,6 +28,7 @@
> #if ENABLE(RESIZE_OBSERVER)
> 
> #include "ActiveDOMObject.h"
>+#include "GCReachableRef.h"
> #include "ResizeObservation.h"
> #include "ResizeObserverCallback.h"
> #include <wtf/RefCounted.h>
>@@ -80,6 +81,7 @@ private:
>     Vector<Ref<ResizeObservation>> m_observations;
> 
>     Vector<Ref<ResizeObservation>> m_activeObservations;
>+    Vector<GCReachableRef<Element>> m_pendingTargets;
>     bool m_hasSkippedObservations { false };
> };
> 
>diff --git a/Source/WebCore/page/ResizeObserverEntry.idl b/Source/WebCore/page/ResizeObserverEntry.idl
>index b051bb57bec6925add74acd265442df05f79832a..72f85dcfce6bc0aa62a8980e25363102bd3492b0 100644
>--- a/Source/WebCore/page/ResizeObserverEntry.idl
>+++ b/Source/WebCore/page/ResizeObserverEntry.idl
>@@ -28,7 +28,8 @@
> [
>     Conditional=RESIZE_OBSERVER,
>     ImplementationLacksVTable,
>-    EnabledBySetting=ResizeObserver
>+    EnabledBySetting=ResizeObserver,
>+    JSCustomMarkFunction
> ] interface ResizeObserverEntry {
>     readonly attribute Element target;
>     readonly attribute DOMRectReadOnly contentRect;
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index b2d158a875b503821e4b6b198dce1eb813ec8fb9..740c80aa189a73bee41925e8e0532d884960c441 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,19 @@
>+2019-05-27  Cathie Chen  <cathiechen@igalia.com>
>+
>+        JS wrapper of target in ResizeObserverEntry/ResizeObserver shouldn't get collected ahead
>+        https://bugs.webkit.org/show_bug.cgi?id=197457
>+
>+        Reviewed by Ryosuke Niwa.
>+
>+        * platform/win/TestExpectations:
>+        * resize-observer/element-leak-expected.txt: Added.
>+        * resize-observer/element-leak.html: Added.
>+        * resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive-expected.txt: Added.
>+        * resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive.html: Added.
>+        * resize-observer/resize-observer-keeps-js-wrapper-of-target-alive-expected.txt: Added.
>+        * resize-observer/resize-observer-keeps-js-wrapper-of-target-alive.html: Added.
>+        * resize-observer/resources/element-leak-frame.html: Added.
>+
> 2019-05-27  Carlos Garcia Campos  <cgarcia@igalia.com>
> 
>         Touch support is reported even when the device doesn't have a touch screen
>diff --git a/LayoutTests/platform/win/TestExpectations b/LayoutTests/platform/win/TestExpectations
>index 754a4a374627ded5ac33d7320687449370ee6a9e..a8ed5e570e6016e627d00cb774b3a736fdbc3616 100644
>--- a/LayoutTests/platform/win/TestExpectations
>+++ b/LayoutTests/platform/win/TestExpectations
>@@ -4392,3 +4392,7 @@ webkit.org/b/195623 http/tests/cache/link-prefetch-main-resource.html [ Skip ]
> webkit.org/b/195623 http/tests/cache/link-prefetch-main-resource-iframe.html [ Skip ]
> 
> webkit.org/b/198112 http/tests/security/showModalDialog-sync-cross-origin-page-load2.html [ Skip ]
>+
>+# The removed elements couldn't be released properly in Win.
>+# The relevant bug is https://bugs.webkit.org/show_bug.cgi?id=197908
>+resize-observer/element-leak.html [ Skip ]
>diff --git a/LayoutTests/resize-observer/element-leak-expected.txt b/LayoutTests/resize-observer/element-leak-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..a25f3dbe173a59b991b2355765501ea4638d8971
>--- /dev/null
>+++ b/LayoutTests/resize-observer/element-leak-expected.txt
>@@ -0,0 +1,4 @@
>+
>+PASS ResizeObserver implemented 
>+PASS Test elements leak 
>+
>diff --git a/LayoutTests/resize-observer/element-leak.html b/LayoutTests/resize-observer/element-leak.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..316f2afcc6646e875424093d990f3c84f9b5eaba
>--- /dev/null
>+++ b/LayoutTests/resize-observer/element-leak.html
>@@ -0,0 +1,42 @@
>+<!DOCTYPE html>
>+<html>
>+<meta name="timeout" content="long">
>+<head>
>+<script src="../resources/testharness.js"></script>
>+<script src="../resources/testharnessreport.js"></script>
>+<script src="../resources/gc.js"></script>
>+</head>
>+<body>
>+<iframe id="testFrame" src="resources/element-leak-frame.html"></iframe>
>+<script>
>+
>+test(_ => {
>+    assert_own_property(window, "ResizeObserver");
>+}, "ResizeObserver implemented");
>+
>+promise_test(async () => {
>+    return new Promise(function(resolve, reject) {
>+        window.addEventListener('message', event => {
>+            switch(event.data) {
>+            case 'Notified':
>+                var testFrame = document.getElementById("testFrame");
>+                let frameDocumentIdentifier = internals.documentIdentifier(testFrame.contentDocument);
>+                testFrame.remove();
>+
>+                handle = setInterval(function() {
>+                    gc();
>+                    if (internals && !internals.isDocumentAlive(frameDocumentIdentifier)) {
>+                        clearInterval(handle);
>+                        resolve();
>+                    }
>+                }, 10);
>+            break;
>+            }
>+         }, false);
>+        setTimeout(() => reject("Test timed out"), 5000);
>+    });
>+}, 'Test elements leak');
>+
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive-expected.txt b/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..a5be9926a5a122dc0b0441c66c1ade67718b3e55
>--- /dev/null
>+++ b/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive-expected.txt
>@@ -0,0 +1,22 @@
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+CONSOLE MESSAGE: ResizeObserver loop completed with undelivered notifications.
>+This tests that JS wrappers of targets in an ResizeObserverEntry do not get collected.
>+
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+PASS
>+
>diff --git a/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive.html b/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..3cf844522af121afdd002ca7869e10282967f48a
>--- /dev/null
>+++ b/LayoutTests/resize-observer/resize-observer-entry-keeps-js-wrapper-of-target-alive.html
>@@ -0,0 +1,60 @@
>+<!DOCTYPE html>
>+<html>
>+<body>
>+<p>This tests that JS wrappers of targets in an ResizeObserverEntry do not get collected.</p>
>+<pre id="log"></pre>
>+<script src="../resources/gc.js"></script>
>+<script>
>+
>+if (window.testRunner)
>+    testRunner.dumpAsText();
>+
>+const targetCount = 5;
>+const iterationCount = 10;
>+
>+async function observe() {
>+    for (let i = 0; i < targetCount; ++i) {
>+        let target = document.createElement('div');
>+        target.myState = 'live';
>+        document.body.appendChild(target);
>+    }
>+
>+    return new Promise((resolve) => {
>+        const observer = new ResizeObserver(entries => {
>+            resolve(entries);
>+            observer.disconnect();
>+        });
>+        document.querySelectorAll('div').forEach(target => observer.observe(target));
>+    });
>+}
>+
>+function check(entries) {
>+    let deadCount = 0;
>+    for (const entry of entries) {
>+        if (entry.target.myState != 'live')
>+            deadCount++;
>+    }
>+    document.getElementById('log').textContent += (deadCount ? `FAIL - ${deadCount} targets lost JS wrappers` : 'PASS') + '\n';
>+}
>+
>+async function runAll() {
>+    if (window.testRunner)
>+        testRunner.waitUntilDone();
>+
>+    for (let j = 0; j < iterationCount; ++j) {
>+        const entries = await observe();
>+        document.querySelectorAll('div').forEach(target => target.remove());
>+        await Promise.resolve();
>+        gc();
>+        check(entries);
>+    }
>+
>+    if (window.testRunner)
>+        testRunner.notifyDone();
>+}
>+
>+runAll();
>+
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive-expected.txt b/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..1fe5345c387b0760b2ebea7d982807bc400fd6d8
>--- /dev/null
>+++ b/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive-expected.txt
>@@ -0,0 +1,4 @@
>+This tests that JS wrappers of targets removed from document to be delivered to an resize observer do not get collected.
>+
>+PASS
>+
>diff --git a/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive.html b/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..98677514fd46b943f4adb0d12702781d0319c72a
>--- /dev/null
>+++ b/LayoutTests/resize-observer/resize-observer-keeps-js-wrapper-of-target-alive.html
>@@ -0,0 +1,55 @@
>+<!DOCTYPE html>
>+<html>
>+<body>
>+<p>This tests that JS wrappers of targets removed from document to be delivered to an resize observer do not get collected.</p>
>+<pre id="log"></pre>
>+<script src="../resources/gc.js"></script>
>+<script>
>+
>+if (window.testRunner)
>+    testRunner.dumpAsText();
>+
>+const targetCount = 5;
>+const iterationCount = 10;
>+var deadCount = 0;
>+
>+async function runAll() {
>+    if (window.testRunner)
>+        testRunner.waitUntilDone();
>+
>+    for (let i = 0; i < iterationCount; ++i) {
>+        runTest();
>+        gc();
>+        await new Promise((resolve) => requestAnimationFrame(resolve))
>+    }
>+
>+    document.getElementById('log').textContent = (deadCount ? `FAIL - ${deadCount} targets lost JS wrappers` : 'PASS') + '\n';
>+
>+    if (window.testRunner)
>+        testRunner.notifyDone();
>+}
>+
>+function runTest() {
>+    document.querySelectorAll('div').forEach(target => target.remove());
>+
>+    for (let i = 0; i < targetCount; ++i) {
>+        let target = document.createElement('div');
>+        target.myState = 'live';
>+        document.body.appendChild(target);
>+    }
>+
>+    document.querySelectorAll('div').forEach(target => observer.observe(target));
>+}
>+
>+const observer = new ResizeObserver(entries => {
>+    for (const entry of entries) {
>+        if (entry.target.myState != 'live')
>+            deadCount++;
>+    }
>+});
>+
>+runAll();
>+
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/resize-observer/resources/element-leak-frame.html b/LayoutTests/resize-observer/resources/element-leak-frame.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..b162d44d424f3a009bb8f31ee350cd48504f4e10
>--- /dev/null
>+++ b/LayoutTests/resize-observer/resources/element-leak-frame.html
>@@ -0,0 +1,26 @@
>+<!DOCTYPE html>
>+<body></body>
>+<script src="../../resources/gc.js"></script>
>+<script type="text/javascript">
>+
>+const targetCount = 1000;
>+var resizeObserver = new ResizeObserver( entries => {
>+    for (let entry of entries)
>+        entry.target.myEntry = entry;
>+
>+    resizeObserver.disconnect();
>+    document.querySelectorAll('div').forEach(target => target.remove());
>+    // Make sure targets be added to m_opaqueRoots.
>+    gc();
>+    parent.postMessage('Notified', '*');
>+});
>+
>+for (let i = 0; i < targetCount; ++i) {
>+    var target = document.createElement('div');
>+    document.body.appendChild(target);
>+}
>+
>+document.querySelectorAll('div').forEach(target => resizeObserver.observe(target));
>+
>+</script>
>+</html>
>\ No newline at end of file

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Attachments on bug 197457: 368670 | 369394 | 369426 | 369680 | 369681 | 369683 | 369738 | 369746 | 369752 | 369755 | 369756 | 369764 | 369833 | 369837 | 369840 | 369844 | 369845 | 369846 | 369847 | 369848 | 369854 | 369861 | 369862 | 369866 | 369870 | 369876 | 369877 | 369921 | 369922 | 369923 | 369925 | 369926 | 369927 | 369935 | 369942 | 370111 | 370681 | 371183 | 371186 | 371241