[Webkit-unassigned] [Bug 189306] New: Georgian uppercase characters unreadable - request temporarily disabling CSS uppercase mappings

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189306

            Bug ID: 189306
           Summary: Georgian uppercase characters unreadable - request
                    temporarily disabling CSS uppercase mappings
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lswartz at google.com

Created attachment 348929

  --> https://bugs.webkit.org/attachment.cgi?id=348929&action=review

screenshot showing tofu for Georgian uppercase on Safari

Unicode 11 added an uppercase version of the modern Georgian script (called “Mtavruli” or “Mkhedruli Mtavruli”), along with “case mappings” between the old (now lowercase) version and the new (uppercase) version. Since this is brand-new, almost no fonts support the new, uppercase versions.

Various webpages and web apps use CSS’s text-transform: uppercase property to do upper-casing...any Unicode 11-compliant browser will thus “case map” the old characters to the new ones...and if the new ones don’t have fonts, they will show up as boxes (“tofu”).

Both Firefox and Chrome (Blink) have already (or are in the process of) temporarily disabling CSS case mappings for Georgian:
https://bugzilla.mozilla.org/show_bug.cgi?id=1476304
https://bugs.chromium.org/p/chromium/issues/detail?id=865427&desc=2

...eventually, once Georgian uppercase fonts are widely distributed, these changse can be reverted.

Steps to reproduce:

1. Visit a webpage that includes case-mapped upper case (e.g. https://www.youtube.com/watch?v=F1B9Fk_SgI0
2. Change webpage to Gerogian (e.g. Go to "3 dot hamburger" menu in upper right, choose "Language" (with A/文 icon), select "ქართული")
3. Notice that the upper case text shows up as "tofu" (boxes)

...screenshot is attached from Safari 11.1.2 (13605.3.8) running on MacBook Pro

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