Re: [w3c/webcomponents] Why do we really need hyphens? (#658)

If typo is `<siv></siv>` why can't render it to `HTMLUnknownElement`? if typo is `<siv></div>` it's an syntax error.  I think the best way is we can override build in element by custom element.
such as `dialog`, `details`, `input`, `table` ...

such as i have an old web application, it mostly used buildin element. if I can upgrade it without modify any code, it sounds so great.

such as we can just use build in element to development our web application. then， enhance the experience by custom element.

eg： development via `<input type="date">`  or `<input type="file">`, enhance the experience by custom `input` element. or `dialog` to custom `dialog` element.
this can make we get more semantics on web.

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