Georgian uppercase characters unreadable - request temporarily disabling CSS uppercase mappings

• Component: CSS
• Status: RESOLVED FIXED

[Luke Swartz]

Created attachment 348929 [details]
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

[Radar WebKit Bug Importer]

<rdar://problem/44142593>

[Katsuhiko Momoi]

Created attachment 348957 [details]
MS Edge browser showing the Youtube page in Georgian language

The image shows what "#20 ON TRENDING" looks like in Georgian.

[Katsuhiko Momoi]

Does MS Edge use Webkit on Windows 10? It probably does not but the user agent string is:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393

this presumably means that this browser is in the same class as Webkit based browsers.

[Myles C. Maxfield]

<rdar://problem/43088314>

[Jungshik Shin]

Kat, Edge does not use webkit. Edge bug is https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/18906984/ .

[Brent Fulgham]

This was fixed in the system Font layer. No changes were needed in WebKit.