[whatwg] Bandwidth media queries

Maciej Stachowiak mjs at apple.com
Sun May 20 15:11:25 PDT 2012

On May 20, 2012, at 6:13 AM, Boris Zbarsky <bzbarsky at MIT.EDU> wrote:

> On 5/20/12 9:04 AM, Boris Zbarsky wrote:
>> On 5/20/12 5:45 AM, Paul Irish wrote:
>>> Since no one mentioned it, I just wanted to make sure this thread is
>>> aware
>>> of the Network Information API [1], which provides
>>> navigator.connection.bandwidth
>>> It's been recently implemented (to some degree) in both Mozilla [2] and
>>> Webkit [3].
>> As far as I can tell, the Mozilla implementation always returns Infinity
>> for .bandwidth.
> Oh, and the WebKit implementation you linked to sometimes returns whatever value the embedding set on the object (thus punting the problem of what to return to the embedding), and by default seems to do this, if I read it right:
> 57	unsigned int NetworkInfoClientEfl::bandwidth() const
> 58	{
> 59	    notImplemented();
> 60	    return 10; // MB/s
> 61	}
> (not exactly spec compliant, so much, of course).

Well spotted. That bug is regrettably still in WebKit trunk. <https://bugs.webkit.org/show_bug.cgi?id=86972>

In addition, the feature is implemented only for a single WebKit port which is not one of the most widely used (EFL), and most other functionality of the NetworkInformation interface is likewise unimplemented. We may end up removing this feature from WebKit if it is not made more functional and/or adopted by more ports. It's not clear if the interface is effectively implementable and the feature is kind of an experiment at the moment.


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