Re: [whatwg/dom] Add Marker interface (PR #1447)

WebReflection left a comment (whatwg/dom#1447)

> We will also need a new "#marker" return value for node.nodeName, and probably a bunch of other little changes.

I missed that, updated [the gist](https://gist.github.com/WebReflection/291357aa6bbbd97d54a971ce5f5aae4e?permalink_comment_id=5952616#gistcomment-5952616) to reflect that too ... it's looking good to me as polyfill:

  * the class extends `Node`, not *comment*
  * both `type` and `name` are reflected
  * all nodes are updated in the living DOM and in each ShadowRoot
  * literally nothing else happens

You can `new Marker(type, name = '')` out of the box but comments found live or appended will be automatically promoted, no "*node substitution*" needed, just like custom elements would.

I hope this will help shaping the specs.

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