Bug 199115 - Incorrect font fallback for decomposed Unicode
Summary: Incorrect font fallback for decomposed Unicode
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Text (show other bugs)
Version: Safari 12
Hardware: All All
: P2 Normal
Assignee: Nobody
URL:
Keywords: BrowserCompat, InRadar
Depends on:
Blocks:
 
Reported: 2019-06-21 12:49 PDT by Nico Rohrbach
Modified: 2019-06-23 18:03 PDT (History)
5 users (show)

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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>