217240 2020-10-02 11:14:01 -0700 REGRESSION (r257839): Broken focus when 'display' changes in an attribute selector 2021-01-13 11:20:53 -0800 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=29241 InRadar P2 Normal --- 1 ajuma webkit-unassigned bfulgham cdumez changseok cmarcelo darin esprehn+autocc ews-watchlist gyuyoung.kim kangil.han koivisto mifenton rniwa simon.fraser tomoki.imai webkit-bug-importer wenson_hsieh zalan oldest_to_newest 1694162 0 410344 ajuma 2020-10-02 11:14:01 -0700 Created attachment 410344 Test case This is similar to bug 216754 and bug 216257 but still broken after those fixes. The conditions needed for this bug are: 1) An element E is display:none because of an attribute selector 2) Script asks for E's computed style's display property 3) The attribute from the attribute selector changes so that E is now display:block 4) Some descendant D of E is focused using D.focus() After r257839, we end up using the stale computed style stored at step (2) when checking for hidden ancestors in Element::isVisibleWithoutResolvingFullStyle(), so incorrectly conclude that D is not visible. I've attached a test case. In practice, this is happening on m.youtube.com in Chrome for iOS, where tapping on the search button will fail to focus the search field. In that case, the code asking for the computed style is actually in Chrome's injected logic for autofill and translation. However, the attached test case reproduces the bug more generally (in MiniBrowser and Safari). 1694179 1 webkit-bug-importer 2020-10-02 12:15:12 -0700 <rdar://problem/69891684> 1718944 2 koivisto 2021-01-12 03:05:32 -0800 Attribute change invalidation fails to invalidate the computed style. 1718948 3 417442 koivisto 2021-01-12 03:45:44 -0800 Created attachment 417442 patch 1719255 4 417524 koivisto 2021-01-13 04:26:29 -0800 Created attachment 417524 patch 1719266 5 koivisto 2021-01-13 05:30:44 -0800 *** Bug 220580 has been marked as a duplicate of this bug. *** 1719270 6 417527 koivisto 2021-01-13 06:07:54 -0800 Created attachment 417527 alternative 1719362 7 koivisto 2021-01-13 11:08:27 -0800 Speedometer A/B looks good. 1719366 8 ews-feeder 2021-01-13 11:20:48 -0800 Committed r271446: <https://trac.webkit.org/changeset/271446> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417524. 410344 2020-10-02 11:14:01 -0700 2020-10-02 11:14:01 -0700 Test case focus.html text/html 936 ajuma PCFET0NUWVBFIGh0bWw+CjxoZWFkPgogIDxzdHlsZT4KICAgIC5jb250YWluZXJbZGF0YS1tb2Rl PSJicm93c2luZyJdIC53cmFwcGVyIHsKICAgICAgICBkaXNwbGF5Om5vbmU7CiAgICB9CgogICAg LmNvbnRhaW5lcltkYXRhLW1vZGU9InNlYXJjaGluZyJdIC53cmFwcGVyIHsKICAgICAgICBkaXNw bGF5OmJsb2NrOwogICAgfQoKICA8L3N0eWxlPgogIDxzY3JpcHQ+CiAgICB3aW5kb3cub25sb2Fk ID0gZnVuY3Rpb24oKSB7CiAgICAgIHZhciBpbnB1dEVsID0gZG9jdW1lbnQuZ2V0RWxlbWVudEJ5 SWQoJ3NlYXJjaGJveCcpOwogICAgICB2YXIgcGFnZVNlYXJjaCA9IGRvY3VtZW50LmdldEVsZW1l bnRCeUlkKCd0cmlnZ2VyJyk7CiAgICAgIHZhciBjb250YWluZXIgPSBkb2N1bWVudC5nZXRFbGVt ZW50c0J5Q2xhc3NOYW1lKCdjb250YWluZXInKVswXTsKICAgICAgdmFyIHdyYXBwZXIgPSBkb2N1 bWVudC5nZXRFbGVtZW50c0J5Q2xhc3NOYW1lKCd3cmFwcGVyJylbMF07CiAgICAgIHdpbmRvdy5n ZXRDb21wdXRlZFN0eWxlKHdyYXBwZXIpLmRpc3BsYXk7CiAgICAgIHBhZ2VTZWFyY2guYWRkRXZl bnRMaXN0ZW5lcignY2xpY2snLCBmdW5jdGlvbihlKSB7CiAgICAgICAgY29udGFpbmVyLnNldEF0 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