Re: [whatwg/dom] document.createEvent() should maybe not be conditional upon exposure (#952)

> so legacy code would assume WebKit's model.

I seem to remember (but Googlers may have more detail) that the internal touch events flag thing and deciding when to be truthful (yes, of course we know what Touch Events are, even if you don't have an actual touchscreen) and when to lie came mostly from looking at (then already) legacy code to see how sites were doing naive "isMobile?" type sniffing and then essentially only listening for touch events and not mouse/keyboard - breaking sites on touch-enabled laptops/desktops. This may have been based on data analysis of "what's the most prevalent pattern that sites use for this sort of naive detection", but I'm not sure).

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