RESOLVED FIXED 275401
Combining mark is not drawn with CSS position:absolute 
https://bugs.webkit.org/show_bug.cgi?id=275401
Summary Combining mark is not drawn with CSS position:absolute
Leon
Reported 2024-06-12 08:14:57 PDT
Created attachment 471660 [details] demonstration of combining mark not being drawn Safari is not drawing the Combining Long Solidus Overlay character in this font in some situations, such as in the attached demo. It is drawn in other browsers.
Attachments
demonstration of combining mark not being drawn (1.86 KB, application/zip)
2024-06-12 08:14 PDT, Leon 		no flags
Details
Patch (5.20 KB, patch)
2024-06-14 21:29 PDT, zalan 		no flags
DetailsFormatted DiffDiff
Patch (5.52 KB, patch)
2024-06-15 06:03 PDT, zalan 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2024-06-12 19:27:51 PDT
Disabling IFC feature fixes this.
zalan
Comment 2 2024-06-12 20:42:05 PDT
This is caused by a paint optimization we have in IFC. The character is measured to be 0px wide (glyph has 0 advance width) and since it's the only content of the out-of-flow box, the box itself ends up being 0px wide too (see shrink-to-fit sizing) and we (erroneously) decide to not paint it -even though there's glyph overflow. (among other things, decoration (e.g. border) throws us off of this "fast" codepath)
Radar WebKit Bug Importer
Comment 3 2024-06-12 20:42:32 PDT
<rdar://problem/129732893>
zalan
Comment 4 2024-06-14 21:29:15 PDT
Created attachment 471682 [details] Patch
zalan
Comment 5 2024-06-15 06:03:10 PDT
Created attachment 471685 [details] Patch
EWS
Comment 6 2024-06-15 17:37:05 PDT
Committed 280057@main (8789afc340e4): <https://commits.webkit.org/280057@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 471685 [details].
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