41000 2010-06-22 11:06:35 -0700 AX: If an element that is a continuation is removed, its parent tree is not notified appropriately that their children have changed 2010-06-22 12:02:00 -0700 1 1 1 Unclassified WebKit Accessibility 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 cfleizach cfleizach bdakin oldest_to_newest 241342 0 cfleizach 2010-06-22 11:06:35 -0700 If you have an element like <a href="#"><h3>asdf</h3>adsf</a> this causes a continuation to occur if one of those children are removed, then its parent chain needs to be notified that an element has been removed. however, because the child is a continuation, its direct render parent, is not the same as its accessibility parent, so the correct AX chain is not being notified this causes VoiceOver to crash and can lead to an ASSERT 241356 1 59396 cfleizach 2010-06-22 11:25:10 -0700 Created attachment 59396 Patch 241358 2 59396 darin 2010-06-22 11:28:54 -0700 Comment on attachment 59396 Patch > + // Go up the accessibility parent chain, but only if the element already exists. Creating an AX element now can be fatal. Is there some better way to say that than "can be fatal"? Maybe say more specifically what's bad about creating an AX element now? > - axObjectCache()->postNotification(renderParent, AXObjectCache::AXLiveRegionChanged, true); > + axObjectCache()->postNotification(axParent->renderer(), AXObjectCache::AXLiveRegionChanged, true); Is axParent->renderer() guaranteed to be non-zero? r=me 241365 3 cfleizach 2010-06-22 11:46:50 -0700 (In reply to comment #2) > (From update of attachment 59396 [details]) > > + // Go up the accessibility parent chain, but only if the element already exists. Creating an AX element now can be fatal. > > Is there some better way to say that than "can be fatal"? Maybe say more specifically what's bad about creating an AX element now? > Will do > > - axObjectCache()->postNotification(renderParent, AXObjectCache::AXLiveRegionChanged, true); > > + axObjectCache()->postNotification(axParent->renderer(), AXObjectCache::AXLiveRegionChanged, true); > > Is axParent->renderer() guaranteed to be non-zero? > yes, otherwise we would not have received an element back. but if a nil is passed to postNotification, there are checks in that as well > r=me 241376 4 cfleizach 2010-06-22 12:02:00 -0700 http://trac.webkit.org/changeset/61622 59396 2010-06-22 11:25:10 -0700 2010-06-22 11:28:53 -0700 Patch bug-41000-20100622112509.patch text/plain 7538 cfleizach SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA2MTYyMSkKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMTkgQEAKKzIwMTAtMDYtMjIgIENocmlzIEZsZWl6YWNoICA8Y2ZsZWl6YWNoQGFw 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