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

Not being able to make custom elements self closing starts to introduce some serious room for error when dealing with slots.

This renders the default content of the slot:
```<my-element></my-element>```

This renders the slot as empty (replaced with whitespace):
```<my-element> </my-element>```

The difference between the two is easy to miss and is problematic, _especially_ when distributing components to outside users. `<my-element />` would be much clearer.


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