Re: [whatwg] allow <link> in body + DOM position as a rendering hint

For import at least I think this change is important (insofar as any authoring conformance criteria is important). See e.g. https://github.com/bterlson/ecmascript/blob/master/spec/index.html for a usage of <link rel="import"> as a kind of "include HTML here" macro that I find to be a useful pattern.