Re: [whatwg/dom] Define dataset as a mixin for HTMLElement and SVGElement (#280)

Yeah I guess the reasoning in your last comment makes sense.

So in terms of HTML changes, I'm thinking, create a new ElementDataset mixin in the section #embedding-custom-non-visible-data-with-the-data-*-attributes, move `[SameObject] readonly attribute DOMStringMap dataset;` there, and then in the HTMLElement definition, add `implements ElementDataset` like we already have for `implements ElementContentEditable`.

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