Same story. Most browsers supported H.264 first (because it was dominant before WebM was even born). Internet Explorer, Safari and MobileSafari still do not sup

Same story. Most browsers supported H.264 first (because it was dominant before WebM was even born). Internet Explorer, Safari and MobileSafari still do not support WebM. I don't see any reasonable way to say that WebM is well-established and H.264 is not.