*notes that the only browsers which pass the test are for Macs*
This should say something about the ACID test and the overall impact on passing it. I personally think the whole 'standards' deal is a load of crap. Its never going to come to pass that everything will be standards complaint. People have written browser specific code for things like IE6 that aren't forewards compatible. As such Microsoft will get ripped a new one by half the people if they break these sites but the other half will give them hell if they don't.
Its a nice dream that someday you'll be able to write html that will display the same in all browsers. The biggest example that this is never going to happen is C/C++. Its been around for a long time and still suffers problems from compilers that break standards or have bugs, etc.