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`moveBefore()`

Proposed by web-platform-tests/interop#1355
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The moveBefore() function moves elements within the DOM without losing various states, such as animation and transition state, :focus, open/close state of popovers, and <iframe> loading state.

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Strict feedback template: Please be as concrete as possible. Specific examples from your production apps or projects provide the highest-value signal to standards editors and browser engineers.
Add your specific real-world use cases, even if they seem obvious to you.
0 / 5000 (min 10)
Are you having to use another feature instead, a polyfill, or is it blocking you completely? Why are the alternatives worse?
0 / 5000 (min 10)
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