[dev_jim]

> As it is right now there are probably several elements toyour site that require different rendering depending on the browser (IE6 I'm glaring at you).

There's a big difference between an additional CSS stylesheet and encoding and storing every single video on your site twice.

> We currently face the same inefficiency of having to encode videos in multiple codecs today. Want your vid on iOS? H.264. Want your vid on other platforms?

Most companies do not encode their videos with multiple codecs. They encode with H.264 and the video will work with an HTML5 player in IE9/Chrome/Safari on the desktop and Safari/Android on mobile. Fallback to Flash is available for older browsers and Firefox. Companies will continue to use this scheme, it just means that Chrome users will now be stuck with a crappy bug-ridden flash player as opposed to a native player.