Bug 191151

Summary: WebKit does not activate small-caps for AAT fonts
Product: WebKit Reporter: Dominik Röttsches (drott) <d-r>
Component: TextAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: bfulgham, mmaxfield, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
WebKit rendering, no small-caps activation for Chancery
none
Expected result, small caps activated for Chancery none

Dominik Röttsches (drott)
Reported 2018-11-01 07:20:00 PDT
1) Go to https://codepen.io/anon/pen/VEoVOp 2) Observe and compare letter shapes in first against second line, third against fourth line Expected result: Letter shapes for the word CURSIVE for first and second line differ, as the first and third line should activate and use the small-caps glyphs contained in the Apple Chancery font. Actual result: Letter shapes identical between first and second line, the first line has "swashy" glyph terminals for U R V I, while it shouldn't since the small-caps glyphs do not have such ornamental terminals. Letter shapes differ for 3rd and 4th line since actual small caps are used for OpenType GSUB based small-caps. This is probably due to small-caps feature detection not recognising the feature in AAT fonts, so WebKit proceeds to synthesise small-caps.
Attachments
WebKit rendering, no small-caps activation for Chancery (31.58 KB, image/png)
2018-11-01 07:21 PDT, Dominik Röttsches (drott) 		no flags
Details
Expected result, small caps activated for Chancery (31.65 KB, image/png)
2018-11-01 07:21 PDT, Dominik Röttsches (drott) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Dominik Röttsches (drott)
Comment 1 2018-11-01 07:21:10 PDT
Created attachment 353596 [details] WebKit rendering, no small-caps activation for Chancery
Dominik Röttsches (drott)
Comment 2 2018-11-01 07:21:31 PDT
Created attachment 353597 [details] Expected result, small caps activated for Chancery
Brent Fulgham
Comment 3 2022-07-01 16:35:31 PDT
Safari and Firefox agree on behavior here, Chrome seems to get the expected output.
Radar WebKit Bug Importer
Comment 4 2022-07-01 16:35:48 PDT
<rdar://problem/96321004>
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