That's going to be up to the other browser vendors. Some would argue that multiple approaches to these problems is a virtue of the ecosystem. (I'm not sure I'm

That's going to be up to the other browser vendors. Some would argue that multiple approaches to these problems is a virtue of the ecosystem. (I'm not sure I'm one of them, but if one accepts that premise than "This documentation varies based upon what browser you're using" is an expected side-effect).