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ProgressEvent and unreachable networkState LOADED in HTMLMediaElement

From: Philip Jägenstedt <philipj@opera.com>
Date: Wed, 25 Jun 2008 16:51:27 +0700
To: HTML WG <public-html@w3.org>
Message-Id: <1214387487.14907.21.camel@localhost>


I'm assuming that the progress events in the HTML 5 spec is intended to
eventually refer to http://dev.w3.org/2006/webapi/progress/Progress.html

This progress events draft states that exactly one of the events
"error", "abort" and "load" must be dispatched. This is easy in most
cases, but what about infinite media resources (streaming) or media
resources so large that the browser can never cache the entire resource
at once (certainly not in memory, and not on disk on devices either).

LOADED: The entire media resource has been obtained and is available to
the user agent locally. Network connectivity could be lost without
affecting the media playback.

The "load" event is dispatched when networkState equals LOADED

If the LOADED networkState is reached only when the entire resource is
cached locally and the load even dispatched only then, none of the
"error", "abort" or "load" events will be dispatched. This doesn't seem
like a big practical problem, but to be compliant with both specs one
would have to cache the entire resource. The simple solution would be to
request that the requirement in the progress events spec be removed,
does anyone have any other ideas? Unless the definition of the LOADED
state is changed, a note to point out that it may not be reachable is in

Somewhat related, is the intention to have the "stalled" event added to
the progress events spec?

Philip Jägenstedt
Opera Software
Received on Wednesday, 25 June 2008 09:52:16 UTC

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