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That's more or less how HTML has always been. Before Chrome, it was IE just adding stuff. Before IE, it was Netscape just adding stuff. JavaScript itself is just a browser adding stuff. Like it or not, W3C standards have always been reactive to what browsers are already doing. And what's really remarkable about this list is that quite a few are supported on Safari on Mac, just not on iOS. Like autofocus. It's just a…
Also autofocus on page load is a terrible idea on iOS as it automatically brings up the keyboard.
No one wants to switch between web pages and suddenly have to wait for the keyboard to appear each time on page load.