ASSIGNED Bug 164816
border-bottom style affects table cells to the right when colspan is present. 
https://bugs.webkit.org/show_bug.cgi?id=164816
Summary border-bottom style affects table cells to the right when colspan is present.
Jon Kleiser
Reported 2016-11-16 00:32:45 PST
Created attachment 294926 [details] HTML file that illustrates the problem When one or more cells in a table are given a class that implies a certain border-bottom style, e.g. "border-bottom: 3px solid #f88;", this style sometimes also affects cells to the right of the selected cell(s). This seems to happen only if the affected row is not the final row in the table. This is demonstrated in the attached HTML file, which may also be seen here: http://folk.uio.no/jkleiser/test/css-bug.html This file also lists the browsers/OSes where the bug has been seen. I have not tested this on mobile/small devices.
Attachments
HTML file that illustrates the problem (2.39 KB, text/html)
2016-11-16 00:32 PST, Jon Kleiser 		no flags
Details
Test reduction (324 bytes, text/html)
2016-11-29 15:13 PST, zalan 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
zalan
Comment 1 2016-11-29 15:13:26 PST
Created attachment 295651 [details] Test reduction
zalan
Comment 2 2016-11-30 16:32:26 PST
This happens because during the collapsed border computation, we ignore the colspan value and pick the before border style for the entire spanning (so the first style wins)
Jon Kleiser
Comment 3 2018-12-12 06:15:44 PST
If my original demo page should be unavailable, a slightly updated page may be found here: https://quickhacks.telegr.am/css-bug.html
Brent Fulgham
Comment 4 2022-07-14 16:55:58 PDT
Safari continues to have this bug in 15.5+
Radar WebKit Bug Importer
Comment 5 2022-07-14 16:56:09 PDT
<rdar://problem/97043314>
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