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I'd be surprised if it uses moveBefore for something that seems to have put so much thought into being portable. moveBefore doesn't even have an entry in MDN yet, the only references I can find to it suggest it's still only available behind a flag in Chrome canary.

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It could support it as a progressive enhancement.

I personally wouldn't even bother with that yet.

Once it's available in even one browser not behind a flag, sure, but while it's still entirely undocumented and only available to people who both use Chrome Canary and know to go turn on a specific flag?

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