Re: [media] issue-152: documents for further discussion

On Wed, May 18, 2011 at 12:44 AM, Bob Lund <> wrote:
> Hi Silvia,
> I had considered @data- attributes but was unsure of the implications of this statement in section of the current HTML5 spec (
> "User agents must not derive any implementation behavior from these attributes or values. Specifications intended for user agents must not define these attributes to have any meaningful values."
> In the case of in-band tracks, the user agent will have to create the DOM equivalent of the @data- attribute for metadata tracks. This appeared to me as being in conflict with the second sentence of the above quote. Is this not the case?

Where would a UA get the information about the special track type from
from in-band metadata tracks? Do you know fields in MP4, Ogg and WebM
that provide such information? If there is such a field that you need
exposed on top of what is already there, then it would indeed make
sense to include that. But I honestly doubt that you will find in-band
tracks that will tell you that they contain adinsertion information or
syncwebcontent data. This is all very application-specific and
therefore can only be solved with external text tracks IMHO. Always
open to hear a real-world use case though!


Received on Wednesday, 18 May 2011 01:36:39 UTC