Re: [whatwg/dom] A faster way to find open shadow roots (or shadow hosts) (#665)

I just wanted to add a maybe more concrete use case. Accessibility testing tools currently are having a pretty hard time testing within shadow DOM, because there is no way to work out where all the shadow roots are. [Axe-core](https://github.com/dequelabs/axe-core) (which I work on) was to a large extent rewritten, exactly because of this limitations. Other accessibility tools, such as HTML_Codesniffer have never supported shadow DOM, and are unlikely to do so without an efficient way to query the flat tree.

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