The market has shown that they can get away with it. Just look at how many sites are designed around IE rather than W3C.Thats cus then it had to have some compliance. now, M$ feels they have teh right to run around creating their own standards. Also, for the | thing, this is rather useful, but I also have session saver which automatically opens that same set of tabs ( fark, slashdot and local news site)
The market has shown that they can get away with it. Just look at how many sites are designed around IE rather than W3C.
That's somewhat debateable, since many major corporations are offenders.That's due more to user ignorance than anything else.
...the customer usually wants it done as quick as possible, and sadly often only cares about the browser that came installed on their computer.