ah you're correct, I misunderstood the meaning of Working Note. It seems like Safari is adding support for WebM this year, but even so since it's still an edito

ah you're correct, I misunderstood the meaning of Working Note. It seems like Safari is adding support for WebM this year, but even so since it's still an editor's draft I think it's reasonable to expect websites to provide alternatives to WebM if unsupported. I guess that's why it was not included in the list of complaints in the origjnal article