Re: [webcomponents] [Accessibility]: Custom element should allow declaration of default accessibility features, such as role and other ARIA attributes. (bugzilla: 20466) (#159)

I think it might be. It's an open question whether those low-level a11y APIs would be tied to custom elements, or something you could install on any element. I tend to lean toward the former since it makes it clearer how to explain native elements, without opening up weird possibilities like using script to override the default a11y behavior for all `<button>`s.

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