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For non-browser use, WebVTT files should be able to specify an external stylesheet directly: Stylesheet: captions.css WebVTT files embedded within WebM would use this to refer to stylesheets also embedded in the file. This is related to #15023, but doesn't require duplicating the stylesheet in every track. For WebVTT files embedded within MKV/WebM, this should find an attachment with the given name. This is how font embedding works for MKV. (@font-face in an inline stylesheet, and in stylesheets loaded from WebM attachments, should do this too.)
Would need to say what the base URL is. I think using the WebVTT file's URL is probably best.
I've upped the priority & importance on this bug, even though I know it doesn't really mean anything. We're about to implement the proposed spec in this bug as the WebVTT spec provides no solution for this right now.
This is redundant with bug 15023 since once you have inline styles you can just use @import. STYLES @import (captions.css); *** This bug has been marked as a duplicate of bug 15023 ***