AV1 codecs string for type attribute of source HTML5 video element

Question

It is quite unclear at the moment what exact type attribute value should be defined for codecs string to make AV1 work in Chromium based browsers. When I put it like that on top of sources (video files without sound track)

type='video/webm; codecs="av1"'

Chrome still refuses to play av1 and picks vp9 to playback that is below

type='video/webm; codecs="vp9"'

Although if I remove codecs string entirely Chrome will play AV1 just fine.

So the question is: What codecs string value should be defined for AV1?

Answer 1

Here is the correct type according this article about using AV1:

<source type="video/webm; codecs=av01.0.05M.08">