[whatwg/dom] Need a method to fire :hover and :active states (#578)

Because emulating (dispatchEvent) of mouse events (mouseenter, mouseover, mousedown) **doesn't** fire `:hover` nor `:active` CSS states we need a methods to toggle `:active` and `:hover` states. Like `Element.focus()` toggles :focus and `Element.blur()` removes `:focus` state. 

I write web App and I can translate touch* events into series of left mouse buttons clicks **but without visual effects** like hovered and activated states. It is annoying for me like for other 34 persons registered on Stack Overflow. 

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https://github.com/whatwg/dom/issues/578