Bug 28859 – offer a way to test if web/dynamic font support is available ?

• Status: RESOLVED
• Resolution: CONFIGURATION CHANGED
• Component: New Bugs

[Jungshik Shin]

http://paulirish.com/2009/font-face-feature-detection/ tries to detect whether a browser supports web/dynamic fonts in Javascript. 

Currently, in Chromium, web font support is off by default and is only enabled with '--enable-remote-font', which is translated into m_downloadableBinaryFontsEnabled of |settings|.   

Whether m_downloadableBinaryFontsEnabled is true or not, |!!window.CSSFontFaceRule| is always 'true' and cannot be used to check whether web/dynamic font is supported. 

Even with m_downloadableBinaryFontsEnabled set to false, SVG fonts are still supported. So we cannot/should not make |!!window.CSSFontFaceRule| false. 


Exposing webkit preferences (read-only) might be a way, but it may be going too far for this unless there are other demands/needs for this.

Perhaps exposing which formats we (think we) support (in the sense of the optional format() clause in the src property in a @font-face rule) would work.

[Jungshik Shin]

Thank you for the suggestion. That is a great idea !

 Do you think this issue has to be brought up more upstream (std-group) than webkit before implementing it in the webkit? 

For my reference, http://www.w3.org/TR/css3-fonts/#font-reference-the-src-descriptor enumerates the values that can be put in optional format param of src descriptor. They're opentype, truetype, truetype-aat,  embedded-opentype, and svg.

[Jungshik Shin]

It's not very clear which W3C WG works on the successor of DOM 2.0 CSS (where
CSSFontFaceRule is defined), webapp or html5 now that W3C DOM WG was disbanded.

[Ahmad Saleem]

[e-mail] & [e-mail] - Is this required anymore? Thanks!

[Ryosuke Niwa]

We have a bunch of JS API for font face now.