1462325 - OpenType font does not render Arabic characters

Status: RESOLVED DUPLICATE of bug 1448180

(Core :: Layout: Text and Fonts, defect)

Description

[David D Lowe]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180516032328

Steps to reproduce:

The test case can be found here:

https://flimm.github.io/adobe-blank-test.html

I am using a font included using font-face CSS rule. This font makes all characters appear as blank. 


Actual results:

The Arabic characters (although not the space in between the characters) are rendered using a fallback font, instead of using the included Adobe Blank font, which does contain glyphs for these Arabic characters. I am using Firefox 60.0.1 (64-bit) in macOS. The bug is reproducible even when using a new profile. I can also reproduce this bug in Firefox for Android (59.0.2).


Expected results:

The correct behaviour is exhibited in Chrome or Safari on macOS: When I open the page in Chrome or Safari, the text in Arabic is blank, indicating that the Adobe Blank glyphs have been used correctly. The correct behaviour also appears in Firefox Developer Edition 61.0b5 (64-bit) on macOS . I am opening this bug report to make sure that the bug stays fixed in the normal Firefox release.

Comment 1

[Gingerbread Man]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
20180516032328

(In reply to David D Lowe from comment #0)
> The Arabic characters (although not the space in between the characters) are
> rendered using a fallback font

I can't reproduce this. Setting platform to Mac OS X.

> The correct behaviour also appears in Firefox Developer Edition 61.0b5 (64-bit) on macOS .

If you can use mozregression to find the fix, we can mark this report as a duplicate of it. Otherwise, it'll probably just be closed as Worksforme.
https://mozilla.github.io/mozregression/quickstart.html