[Webkit-unassigned] [Bug 199115] New: Text characters with diacritic are not rendered properly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199115

            Bug ID: 199115
           Summary: Text characters with diacritic are not rendered
                    properly
           Product: WebKit
           Version: Safari 12
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nico at superpixel.ch
                CC: mmaxfield at apple.com

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.)

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