[whatwg/dom] Determine spec of copying the internal state of node when "clone a node" (#644)

The standard in this place is vague. https://dom.spec.whatwg.org/#concept-node-clone
Now all browsers is copying the internal state of radio buttons, checkboxes, inputs type file when deep clone node, but not selected value of select element.
It is logical to bring everything to a consistent form (copy internal state for all interactive elements)

Reason: cloneNode(true) does not clone value of select. Examlple https://codepen.io/anon/pen/bMWKdO
Discussion of spec https://stackoverflow.com/questions/27193301/node-clonenode-inconsistent-with-dom-spec

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