All of those APIs are the gravy on top of cherries. Most websites don't even use them. IE9 and older blatantly ignored and/or reimplemented key browser function

All of those APIs are the gravy on top of cherries. Most websites don't even use them. IE9 and older blatantly ignored and/or reimplemented key browser functionality such as rendering and DOM querying APIs. It was a mess. Whatever Safari is or isn't doing doesn't even compare.