What are you talking about? Video formats have a whole mad type parameter for this stuff https://jakearchibald.com/2022/html-codecs-parameter-for-av1...
It's not mandatory, and it would work without using it. The whole point is for forward compatibility support effect for sites which are very slow introducing these kind of changes.
It's not mandatory, and it would work without using it. The whole point is for forward compatibility support effect for sites which are very slow introducing these kind of changes.