Re: [sdw] What would implementing WebVMT mean for user agents?

I've now revised the [explanatory spec for WebVMT](http://w3c.github.io/sdw/proposals/geotagging/webvmt/) to move the `div-id` and `tile-url` parameters to <track> element attributes, and successfully implemented these changes in the tech demo to verify the new design.

This highlights another inferred step in the user agent development process, which precedes steps 1 and 2, listed above by @tidoust:

0. User agent support for WebVMT can be implemented in Javascript, using the <track> element as described in the spec, without requiring any change to the agent itself. The modified track element doesn't cause a problem as HTML handles errors gracefully and the unknown attributes should be simply ignored by the parser, allowing the WebVMT format to be used with immediate effect.

Steps 1 and 2 can occur in either order, as each must define an interface (cue or map respectively) which can be incorporated into the existing solution from step 0. Hence, step 2 is linked to WebVMT development, though not in a way that obstructs its progress, and should be considered as a separate issue.

Thanks to @cmheazel for moving his comments to a separate discussion in [issue #1020](https://github.com/w3c/sdw/issues/1020)

If there are no further queries on this issue, I will close it.

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Received on Friday, 11 May 2018 16:48:41 UTC