RESOLVED FIXED 218256
REGRESSION (r258321): CSS rules using :first-of-type are applied to any/all siblings in a group under certain circumstances 
https://bugs.webkit.org/show_bug.cgi?id=218256
Summary REGRESSION (r258321): CSS rules using :first-of-type are applied to any/all s...
Eben Packwood
Reported 2020-10-27 13:23:30 PDT
Created attachment 412456 [details] Minimal working example In the attached example, when using Safari 14 or Safari Technology Preview, moving the mouse over the different elements of the page will result in the CSS rule `table td:first-of-type {color: red;}` being applied to potentially any arbitrary sibling in a group. Only the first `td` in each group should be colored red, but mousing over and out of the other `td` elements results in these element also being colored red. This also occurs with various other properties.
Attachments
Minimal working example (1.19 KB, text/html)
2020-10-27 13:23 PDT, Eben Packwood 		no flags
Details
patch (6.57 KB, patch)
2021-01-11 08:24 PST, Antti Koivisto 		no flags
DetailsFormatted DiffDiff
patch (6.47 KB, patch)
2021-01-11 09:09 PST, Antti Koivisto 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2020-10-27 20:12:27 PDT
<rdar://problem/70749584>
Antti Koivisto
Comment 2 2020-10-28 01:34:22 PDT
style sharing bug perhaps?
Antti Koivisto
Comment 3 2020-10-28 01:36:19 PDT
A decent theory is that the animation code is losing the bits that prevent style sharing.
Antti Koivisto
Comment 4 2020-10-28 02:24:30 PDT
Yeah, disabling style sharing makes the bug go away.
Antti Koivisto
Comment 5 2021-01-11 08:24:41 PST
Created attachment 417380 [details] patch
Antti Koivisto
Comment 6 2021-01-11 09:09:34 PST
Created attachment 417386 [details] patch
EWS
Comment 7 2021-01-11 10:12:25 PST
Committed r271367: <https://trac.webkit.org/changeset/271367> All reviewed patches have been landed. Closing bug and clearing flags on attachment 417386 [details].
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