[Webkit-unassigned] [Bug 235495] New: HTML lang attribute doesn't always call font's LOCL feature

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235495

            Bug ID: 235495
           Summary: HTML lang attribute doesn't always call font's LOCL
                    feature
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben at fontpad.co.uk
                CC: mmaxfield at apple.com

Some languages are not working on Safari as in other browsers. Test page: http://test.fontpad.co.uk/Testing/MyanmarLOCLTest.html

Along with the default Burmese numerals, the font contains localisations for Khamti (lang="kht"), Pa'O ("blk"), Pwo ("pwo"), Aiton ("aio"), Phake ("phk"), which are accessed using the font's LOCL feature and a lang attribute on the HTML element. All of those work fine in Firefox and Chrome, but Safari shows only the Khamti localisation. (Shan and Tai Laing / Shan Ni have their own codepoints so no substitutions are needed.)

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