Re: [w3c/webcomponents] If a Custom Element is used as a placeholder for an HTML heading, would it be interpreted as a heading for SEO purposes? (#730)

> It depends on whether the search engine in question understands custom elements.

Probably that's a problem right now. F.e., @Sylphony, a bot that just reads HTML strings (without looking at the JavaScript DOM objects) could not possibly know that `<my-header-1>` is an extended `<h1>`.

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