Verified that you can `appendChild` the same element to different elements and it just moves around instead of e.g. an "already attached to a parent" error
I can control Spotify Web player now.
When pressing play from the media controller, the title changes to the album name, as Spotify updates the page title only after the player started playing and we don't monitor the title tag yet, but this is unrelated to this patch
Didn't notice anything unusual while casually browsing the web