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.
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?
