WebM - No alpha support in Safari

[MendyBerger]

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

Safari doesn't have full WebM support, as it doesn't support alpha channels.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

Partial support for Safari

Did you test this? If so, how?

Yes. With https://rotato.netlify.app/alpha-demo/movie-webm.webm.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

No response

MDN URL

No response

MDN metadata

No response