Re: [whatwg/dom] matchMedia-like API for element matches (Issue #1225)

This would be super handy. Especially for subscribing to the open/close state of popovers. 

Unlike with dialogs where you can just subscribe to the `open` property via a [Mutation Observer](https://www.google.com/search?q=mutation+observer&sourceid=chrome&ie=UTF-8)), with popovers you are limited to checking for the `:popover-open` pseudo class.

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