[magicalhippo]

There are many valid reasons why autoplaying videos should be up to the user.

I'm generally against autoplaying, but I do accept that in some cases it is a nice thing.

So this proposal seems reasonable, if the browsers in addition get a separate option to disable this behavior.

It's important though that javascripts can't override this behavior to prevent abuse (say by unmuting), so browsers would have to take some precaution against that.