W3C home > Mailing lists > Public > www-style@w3.org > January 2009

@font-face support detectable in Javascript?

From: Dave Crossland <dave@lab6.com>
Date: Wed, 7 Jan 2009 12:55:43 +0000
Message-ID: <2285a9d20901070455h72a82c00h27a564153db6d57@mail.gmail.com>
To: "www-style@w3.org" <www-style@w3.org>
Cc: "Ed Trager" <ed.trager@gmail.com>

Hi,

This thoughtful email came up on the OpenFontLibrary.org mailing list,
and I thought I would forward it here :-)

2009/1/7 Ed Trager <ed.trager@gmail.com>:
> Hi, everyone,
>
> It would be nice if there were a way to query the browser (using
> Javascript) about whether web fonts are supported or not.  If that
> were possible, then a web site like the new OFLB site could
> dynamically show the web font preview when supported, and hide it from
> view when not supported.
>
> The Javascript would be trivial to write but my investigation so far
> has not revealed any way of detecting web font support.
>
> It is a common "best practice" principle when coding in Javascript
> nowadays to check for the existence of certain properties.  If the
> property exists, then we can exploit the functionality whose presence
> is implied by the presence of that property.  If not, we can code
> around it.
>
> So perhaps we need to encourage the browser developers to expose a
> public property, or document such if it already exists:
>
>           if( thisBrowser.supportsWebFonts ){
>                         myWebFontDiv.style.display="block";
>           }else{
>                         myWebFontDiv.style.display="none";
>           }
>
> While I agree that the new OFLB site needs to rally toward the future,
> unfortunately it looks clunky to say "The text to the right should be
> rendered in Font_xxxx thanks to web font linking with @font-face. If
> you see a monospace font, your web browser probably does not yet
> support this new web technology."
>
> On my laptop, I see DejaVu Mono Sans used in FF 3.0.5 for the
> unsupported @font-face preview.  The problem is, unless I look very
> closely, I might actually think that I *have* got a preview of
> "Font_xxx" --especially if "Font_xxx" is some kind of sans serif font
> (like Puritan, for example)!
>
> If someone on this list has any ideas on how to check for @font-face
> support using Javascript, please let all of us know about it.
>
> - Ed Trager
Received on Wednesday, 7 January 2009 12:56:23 GMT

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