Bug 199115

Summary:	Incorrect font fallback for decomposed Unicode
Product:	WebKit	Reporter:	Nico Rohrbach <nico>
Component:	Text	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ahmad.saleem792, ap, fantasai.bugs, mitz, mmaxfield, simon.fraser, vitor.roriz, webkit-bug-importer
Priority:	P2	Keywords:	BrowserCompat, InRadar
Version:	Safari 12
Hardware:	All
OS:	All
See Also:	https://bugs.webkit.org/show_bug.cgi?id=68287
Bug Depends on:
Bug Blocks:	206208

Description Nico Rohrbach 2019-06-21 12:49:04 PDT

The Unicode specification states that a precomposed character like LATIN SMALL LETTER A WITH DIAERESIS (U+00E4) should have the same appearance and meaning when displayed, as the decomposed character sequence LATIN SMALL LETTER A (U+0061) and COMBINING DIAERESIS (U+0308).

On web pages that use web fonts, characters with diacritic (like: ä, ñ, é, å, ç, î, …) are not rendered properly, if they are encoded as decomposed character sequence.

You can find a test case under the following url:
https://superpixel.ch/bugreport/safari-diacritic/

Safari 12 on Mac and iOS do not render these characters properly, as well as Safari Technology Preview Release 85. (Chrome 75 renders decomposed character sequences properly.)

Comment 1 Radar WebKit Bug Importer 2019-06-22 00:23:51 PDT

<rdar://problem/52014951>

Comment 2 Myles C. Maxfield 2021-07-26 21:40:29 PDT

<rdar://problem/54615370>