HTML Needs New Tags
I am a firm believer of standard based software development. When it comes to web standards such as HTML and JavaScript, I should also add that the standards need to evolve. The way the web standards evolve is through experiments of their implementations. That's why I was excited about the Mozilla canvas tag when it first appeared. That's why I'm excited about the video tag that Brendan Eich, the King of Mozilladom, mentions in his blog:
Brendan Eich: From the inimitable Chris Double of Mozilla's New Zealand brain trust: moving, rotating, scaling <video> in SVG (so who needs yet another non-standard plugin?).
It is true that these tags are not part of the HTML standard, yet. But there is no reason why they can't be. It may take some time before all the vendors agree on the exact syntax. Some vendors may even resist the incorporation of such innovations. But at the end of the day, it is the usefulness of these new tags that will attract web content developers, and through them, the web content consumers.
As to the comment "Why needs yet another non-standard plugin?" The answer is "Mozilla has always needed non-standard plugins." Try removing all non-standard plugins from your browser and see if the web still "works"? The trick is to standardize the access to such plugins in a way that promotes competition and prevents lock-ins.