I believe the rule is not to play until clicked, for videos with sound. However, for videos that don't have sound, they are allowed to play at page-load. Also, due to this functionality, sites now have a sound-less video first play and then switch to a version with sound (faking "un-muting") when clicked. This does have the nice side-effect of eliminating those really annoying ads that used to play at full blast whenever I forgot to mute my laptop's sound. (Nonetheless, I still reflexively turn my laptop's speakers down to 5% when I am not using them after getting burned so many times in public.)
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