[whatwg/dom] CDATA section can be imported into HTML document (Issue #1420)

meiqinyan created an issue (whatwg/dom#1420)

### What is the issue with the DOM Standard?

`Document.importNode()` can be called with a CDATA section node as the first argument, in effect allowing for a CDATA section to belong to a HTML document. Given that `.createCDATASection()` for HTML throws an exception, the intent appears to be that this is not supposed to be possible.

While this situation is somewhat bizarre, as far as I can tell there are not any inconsistencies that actually result from this. Maybe changing `.createCDATASection()` to behave the same in HTML as XML would be less surprising?

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