all of them were written in a way that mostly affect the api, not the underlying implementation models tho. it's still 500 new things to test and actually impl

all of them were written in a way that mostly affect the api, not the underlying implementation models tho. it's still 500 new things to test and actually implement. but not as bad as the original 1 to 2 change. html5 was the forever missed opportunity to do things right. but keeping the browser-side effort low was always fought for on the w3 committe.