85067 2012-04-27 08:01:54 -0700 [chromium] Put fixed-position elements in a stacking context so that they can be composited 2012-07-08 19:29:01 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 87186 P2 Normal --- 1 husky husky abarth dglazkov fishd husky jamesr klobag skyostil tkent+wkapi vangelis webkit.review.bot oldest_to_newest 611500 0 husky 2012-04-27 08:01:54 -0700 [chromium] Put fixed-position elements in a stacking context so that they can be composited 611515 1 139207 husky 2012-04-27 08:21:13 -0700 Created attachment 139207 Patch 611518 2 husky 2012-04-27 08:23:23 -0700 I still need to add a layout test for this, but I've uploaded this so we can start discussing this change. With this setting enabled, fixed position elements won't be handled according to the spec -- the z-ordering of child elements with respect to the rest of the page could be different. However, most sites should be unaffected, and this is arguably becoming the de facto standard for mobile browsers. 611519 3 webkit.review.bot 2012-04-27 08:24:09 -0700 Please wait for approval from abarth@webkit.org, dglazkov@chromium.org, fishd@chromium.org, jamesr@chromium.org or tkent@chromium.org before submitting, as this patch contains changes to the Chromium public API. See also https://trac.webkit.org/wiki/ChromiumWebKitAPI. 611520 4 webkit.review.bot 2012-04-27 08:24:32 -0700 Attachment 139207 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1 Source/WebCore/ChangeLog:13: You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible. [changelog/nonewtests] [5] Total errors found: 1 in 9 files If any of these errors are false positives, please file a bug against check-webkit-style. 611539 5 husky 2012-04-27 08:49:01 -0700 I'm looking for an existing layout test that covers a specific field in Settings, to see the best way of flipping it in Javascript, but I can't seem to find one. Can anyone point me at one? Thanks! 611806 6 139207 jamesr 2012-04-27 13:08:40 -0700 Comment on attachment 139207 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=139207&action=review I think based on our experience from MobileSafari and Android we should try this out via WebKit nightlies / Chrome dev+canary to see if we can simply make this the new behavior, and if the compat issues aren't too bad propose it as an errata to CSS 2.1. position:fixed behavior is just freakin' weird > Source/WebCore/rendering/RenderLayer.h:383 > - bool isStackingContext() const { return !hasAutoZIndex() || renderer()->isRenderView(); } > + bool isStackingContext() const; I suspect isStackingContext() is fairly hot. If so, I think we should make this compile-time rather than runtime for performance reasons, even though that does make the testing situation a bit harder to deal with. 611810 7 jamesr 2012-04-27 13:09:23 -0700 Iain - to move this forward can you try to collect some data on whether isStackingContext() is a hot enough function for us to worry about out-of-lining it and doing a walk to Settings? 611855 8 jamesr 2012-04-27 13:38:09 -0700 It would also be interesting to run the current layout test suite with position:fixed always making a stacking context to see what's different. 645978 9 husky 2012-06-11 07:08:24 -0700 *** This bug has been marked as a duplicate of bug 87186 *** 664547 10 139207 laszlo.gombos 2012-07-08 19:29:01 -0700 Comment on attachment 139207 Patch It seems that this patch is obsolete as a duplicate is landed as r118263. Setting the obsolete flag to take the patch out from the review queue. 139207 2012-04-27 08:21:13 -0700 2012-07-08 19:29:01 -0700 Patch bug-85067-20120427162111.patch text/plain 8694 husky U3VidmVyc2lvbiBSZXZpc2lvbjogMTE1NDMwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZTMzNjE4MTVlYWIyYmM0 MjUwNTc2NzFmOWUxYzliOGZhMjlkMGZiOC4uZWQxYjI2OWE5NDg3N2IzNzIwOTdjMGEyMDYzNTc3 MzhkNzNhNDI4MCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMwIEBACisyMDEyLTA0LTI3ICBJYWlu IE1lcnJpY2sgIDxodXNreUBnb29nbGUuY29tPgorCisgICAgICAgIEFkZCBhIFNldHRpbmcgdG8g cHV0IGFsbCBmaXhlZC1wb3NpdGlvbiBlbGVtZW50cyBpbiBhIHN0YWNraW5nIGNvbnRleHQuCisg ICAgCisgICAgICAgIFRoaXMgaXMgbmVlZGVkIGZvciBhY2NlbGVyYXRlZCBjb21wb3NpdGluZyBv ZiBmaXhlZC1wb3NpdGlvbiBlbGVtZW50cworICAgICAgICB0aGF0IGFyZW4ndCBhbHJlYWR5IGlu IGEgc3RhY2tpbmcgY29udGV4dCAoaS5lLiBkb24ndCBoYXZlIGEgdHJhbnNmb3JtCisgICAgICAg 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