This issue is applicable to Persian, Urdu and Sindhi. Persian, Urdu and Sindhi use extended-arabic-indic codepoints for digits in list counter styles. However, languages that use these code points tend to prefer specific glyph shapes for certain numbers, as shown here. https://r12a.github.io/scripts/arab/ur.html#numbers The GAP An intelligent opentype font may be able to detect the language of the text and substitute appropriate glyphs if it is used for the content, but here we are looking at the default behaviour of the browser, with no fonts explicitly assigned to the text. Blink displays Persian digit glyphs in all three cases. Webkit renders the correct glyphs for Persian and Urdu, but not for Sindhi. Gecko renders Persian glyph shapes throughout, even though it uses different fonts for Persian vs. Urdu/Sindhi. Tests & results Interactive test, The browser uses appropriate digit glyph shapes for Persian, Urdu, and Sindhi by default. https://github.com/w3c/glyph_character_tests/issues/32 I suppose one fix for this would be to fall back to appropriate fonts based on the language of the text. There may also be other options i'm unaware of. It's not clear to me how Safari gets the Urdu correct.
<rdar://problem/130211021>