Re: [w3c/DOM-Parsing] insertAdjacentHTML is broken (#4)

["insert adjacent"](https://dom.spec.whatwg.org/#insert-adjacent) doesn't fit here because `insertAdjacentHTML()` for `"beforebegin"` and `"afterend"` throw `"NoModificationAllowedError"` when context doesn't have parent (Firefox/Chrome/IE11 do this).
For `insertAdjacentText()` and `insertAdjacentElement()` and the same position whe have:
Chrome/Firefox return null for both
IE11 throw for `insertAdjacentText()` but not for `insertAdjacentElement()` and return passing element.
Presto throw for `insertAdjacentElement()` but not for `insertAdjacentText()` and return undefined.
I will update tests in WPT to check this cases.

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