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w3c / webvtt

WebVTT Standard
https://w3c.github.io/webvtt/
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VLC feedback: explicitly list CSS features supported in WebVTT #391

Open silviapfeiffer opened 7 years ago

silviapfeiffer commented 7 years ago

Particularly for user agents that do not support CSS, it's important to list all the CSS features that are supported in CSS, particularly in the STYLE element.

dwsinger commented 7 years ago

Not sure I completely understand. There are UAs that don't do CSS; all you get is the basic nuilt-in styling support (which needs to include color, and currently has stuff like ). There are UAs that do support CSS, and I suppose we could list the CSS that they need to support (2.1?), but should we?

silviapfeiffer commented 7 years ago

There are some css selectors that are allowed to be applied to cues and spans. We should give non CSS user agents a chance to implement those for use inside the STYLE tag. But we need to list them more explicitly in the format section and take out of the rendering section.

dwsinger commented 7 years ago

We could say that a non-CSS user-agent may implement selected CSS features, or even should implement simple ones that we mention in the document and list, sure.

silviapfeiffer commented 7 years ago

Yes, indeed 😀