Bromite can play AV1 videos since release 71.0.3578.72; the codec/mime is reported as probably by the HTML5 video canPlayType Javascript API since release 72.0.3626.68.

A fully-qualified AV1 codec descriptor should be used when querying the canPlayType API, example:

video/webm; codecs="av1" is not presently sufficient. A valid mime/codec would be: video/webm; codecs="av01.0.05M.08"

A developer tools console one-liner to test the availability of AV1:

> document.createElement('video').canPlayType('video/webm; codecs="av01.0.05M.08"')
< "probably"

("probably" is the result you will receive with current Chrom* for desktop and Bromite, but not with Chrom* for Android).

• https://tools.woolyss.com/html5-audio-video-tester/?u=https://github.com/chromium/chromium/raw/master/media/test/data/bear-av1.webm
• http:https://download.opencontent.netflix.com/?prefix=AV1/Chimera/ (no HTML5 player there)

• mime/codec relevant source: https://cs.chromium.org/chromium/src/media/base/video_codecs.cc?rcl=ebbc328f42880260a30379c3f7828bcc8f33387f&l=262 (which points to https://aomediacodec.github.io/av1-isobmff/#codecsparam