Re: [whatwg/dom] Expose document fragment serialization algorithm (#965)

See the following public-webapps threads:
- https://lists.w3.org/Archives/Public/public-webapps/2011OctDec/0663.html
- https://lists.w3.org/Archives/Public/public-webapps/2012AprJun/0022.html
- https://lists.w3.org/Archives/Public/public-webapps/2012AprJun/0273.html

This wasn't really prevented / motivated by the compatibility concern. It was because `innerHTML` on `template` and `ShadowRoot` was conceptualized as a way to be able to support setter. With `DocumentFragment` which is not `ShadowRoot`, we don't know the context element so we need to decide which parsing mode to use. It would be indeed weird & controversial to introduce `innerHTML` that only supports getting but not setting since that could be a compatibility concern especially if we decide to throw an exception in the setter.

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