Re: [w3c/webcomponents] Custom 'void' or self-closing elements (HTML parser changes) (#624)

Let me add the specific example of [A-Frame](https://aframe.io/docs/0.9.0/introduction/html-and-primitives.html) - a large Mozilla effort using custom elements which would benefit quite substantially from self-closing tags since all content is in attributes.

Related, but somewhat off-topic, is the use of Unknown Elements to carry meta-information (`<databasefield name='partID' value='xyz' />`), or in custom extensions.


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