187824 2018-07-19 15:14:14 -0700 AX: Press tab to highlight items on a webpage is not working with voiceover enabled 2018-07-23 14:24:22 -0700 1 1 1 Unclassified WebKit Accessibility WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 n_wang webkit-unassigned aboxhall apinheiro cdumez cfleizach dbates dmazzoni esprehn+autocc ews-watchlist jcraig jdiggs kangil.han n_wang rniwa samuel_white webkit-bug-importer zalan oldest_to_newest 1443535 0 n_wang 2018-07-19 15:14:14 -0700 1. Ensure that press tab to highlight items on a webpage is enabled (Safari>preferences>advanceed>press-ta to highlight items on a webpage) 2. visit a website like: http://www.apple.com, and attempt to press tab to move back and forth through various navigation elements on the webpage. 3. Ensure this with voiceover enabled. Expected: pressing tab would allow the cursor to highlight individual elements. Actual, the cursor does not move. <rdar://problem/41448721> 1443537 1 345390 n_wang 2018-07-19 15:21:32 -0700 Created attachment 345390 patch 1443649 2 345390 zalan 2018-07-19 19:02:28 -0700 Comment on attachment 345390 patch View in context: https://bugs.webkit.org/attachment.cgi?id=345390&action=review > Source/WebCore/dom/Document.cpp:1871 > + } Any style mutation with an associated renderer will trigger a RenderElement::setStyle() call. Even mutations that don't need layout. Consulting StyleDifference in setStyle() might be a better way to get the AX cache updated. Also you may want to limit the performDeferredCacheUpdate() calls to focusable elements since calling AX cache on every repaint could be a performance hit. 1443674 3 345390 n_wang 2018-07-19 21:30:30 -0700 Comment on attachment 345390 patch View in context: https://bugs.webkit.org/attachment.cgi?id=345390&action=review >> Source/WebCore/dom/Document.cpp:1871 >> + } > > Any style mutation with an associated renderer will trigger a RenderElement::setStyle() call. Even mutations that don't need layout. Consulting StyleDifference in setStyle() might be a better way to get the AX cache updated. > Also you may want to limit the performDeferredCacheUpdate() calls to focusable elements since calling AX cache on every repaint could be a performance hit. Here we are doing the AX cache update on the document level and it's under the styleUpdate check. Are you saying: 1. frameView.needsLayout() check is not enough, we should use the StyleDifference in renderElement? 2. We should move the AX cache update to a RenderElement level, so for each RenderElement we check and update the cache in setStyle()? I think performDeferredCacheUpdate() is designed as a batch update mechanism. We are calling that in FrameView performPostLayoutTasks(). So I'm looking for some place similar, that indicates the FrameView;s style is resolved. 1443676 4 zalan 2018-07-19 21:43:56 -0700 (In reply to Nan Wang from comment #3) > Comment on attachment 345390 [details] > patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=345390&action=review > > >> Source/WebCore/dom/Document.cpp:1871 > >> + } > > > > Any style mutation with an associated renderer will trigger a RenderElement::setStyle() call. Even mutations that don't need layout. Consulting StyleDifference in setStyle() might be a better way to get the AX cache updated. > > Also you may want to limit the performDeferredCacheUpdate() calls to focusable elements since calling AX cache on every repaint could be a performance hit. > > Here we are doing the AX cache update on the document level and it's under > the styleUpdate check. Are you saying: > 1. frameView.needsLayout() check is not enough, we should use the > StyleDifference in renderElement? > 2. We should move the AX cache update to a RenderElement level, so for each > RenderElement we check and update the cache in setStyle()? I think > performDeferredCacheUpdate() is designed as a batch update mechanism. We are > calling that in FrameView performPostLayoutTasks(). So I'm looking for some > place similar, that indicates the FrameView;s style is resolved. Oh right, this is the "perform" and not the "dirtying" part. So who is dirtying the AX tree when non-layout type of mutation happens? I would assume that if AX tree sees that the mutation is not going to trigger layout, it could just issue a timer and update the tree in the next runloop. 1443681 5 345390 n_wang 2018-07-19 21:52:13 -0700 Comment on attachment 345390 patch View in context: https://bugs.webkit.org/attachment.cgi?id=345390&action=review >>>> Source/WebCore/dom/Document.cpp:1871 >>>> + } >>> >>> Any style mutation with an associated renderer will trigger a RenderElement::setStyle() call. Even mutations that don't need layout. Consulting StyleDifference in setStyle() might be a better way to get the AX cache updated. >>> Also you may want to limit the performDeferredCacheUpdate() calls to focusable elements since calling AX cache on every repaint could be a performance hit. >> >> Here we are doing the AX cache update on the document level and it's under the styleUpdate check. Are you saying: >> 1. frameView.needsLayout() check is not enough, we should use the StyleDifference in renderElement? >> 2. We should move the AX cache update to a RenderElement level, so for each RenderElement we check and update the cache in setStyle()? I think performDeferredCacheUpdate() is designed as a batch update mechanism. We are calling that in FrameView performPostLayoutTasks(). So I'm looking for some place similar, that indicates the FrameView;s style is resolved. > > Oh right, this is the "perform" and not the "dirtying" part. So who is dirtying the AX tree when non-layout type of mutation happens? I would assume that if AX tree sees that the mutation is not going to trigger layout, it could just issue a timer and update the tree in the next runloop. This one is triggered in Document::setFocusedElement() if (!focusChangeBlocked && m_focusedElement) { // Create the AXObject cache in a focus change because GTK relies on it. if (AXObjectCache* cache = axObjectCache()) cache->deferFocusedUIElementChangeIfNeeded(oldFocusedElement.get(), newFocusedElement.get()); } Should we just do not defer in this case? 1443692 6 345429 n_wang 2018-07-19 22:42:34 -0700 Created attachment 345429 patch update from review 1444290 7 n_wang 2018-07-23 10:00:14 -0700 Zalan, can you take another look at my patch? 1444296 8 345429 zalan 2018-07-23 10:10:05 -0700 Comment on attachment 345429 patch View in context: https://bugs.webkit.org/attachment.cgi?id=345429&action=review > Source/WebCore/ChangeLog:13 > + happens. When the timer fires, you should check if there's a pending layout and let the layout trigger the AX update. This is for the cases when you have different type of mutations coming the same time with the focus change. 1. focus change 2. focus change 3. tree mutation 4. some other style mutation In this case your timer will fire before the layout timer and you should really just not do anything at this point. 1444315 9 345583 n_wang 2018-07-23 10:57:56 -0700 Created attachment 345583 patch update from review. 1444396 10 345583 zalan 2018-07-23 13:45:50 -0700 Comment on attachment 345583 patch View in context: https://bugs.webkit.org/attachment.cgi?id=345583&action=review > Source/WebCore/accessibility/AXObjectCache.cpp:2861 > + RefPtr<FrameView> frameView = document().view(); > + RenderView* renderView = document().renderView(); > + bool needsLayout = frameView && renderView && (frameView->layoutContext().isLayoutPending() || renderView->needsLayout()); if (!document().view() || document().view()->needsLayout()) return; This should do (when the tree is dirty there must be a pending layout scheduled). 1444414 11 n_wang 2018-07-23 14:24:22 -0700 Committed r234112: <https://trac.webkit.org/changeset/234112> 345390 2018-07-19 15:21:32 -0700 2018-07-19 22:42:34 -0700 patch patch.txt text/plain 4717 n_wang SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDIzNDAwNykKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE5IEBACisyMDE4LTA3LTE5ICBOYW4gV2Fu ZyAgPG5fd2FuZ0BhcHBsZS5jb20+CisKKyAgICAgICAgQVg6IFByZXNzIHRhYiB0byBoaWdobGln aHQgaXRlbXMgb24gYSB3ZWJwYWdlIGlzIG5vdCB3b3JraW5nIHdpdGggdm9pY2VvdmVyIGVuYWJs ZWQKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE4Nzgy NAorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFdlIGFy ZSBkZWZlcnJpbmcgcG9zdGluZyBmb2N1c2VkIGVsZW1lbnQgY2hhbmdlIG5vdGlmaWNhdGlvbiB3 aGVuIHRoZSBkb2N1bWVudCBuZWVkcyBhCisgICAgICAgIHN0eWxlIHJlY2FsY3VsYXRpb24uIEhv 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