You don't really get to "define a standard", the W3C does. Standards are about the way the web should be, not the way it is. The difference is between adopting

You don't really get to "define a standard", the W3C does. Standards are about the way the web should be, not the way it is. The difference is between adopting open standards that others haven't gotten around to yet versus inventing your own undocumented functionality for the purpose of making compatibility impossible. Apple is further down the track. MS was trying to derail the train. Making you download Safari does seem a strange choice. But then, the whole point of the page is "look how well these things work in Safari", so why not?