If you want to display spotify using the webview widget you will get a message that wants you to install the spotify app because the webview uses the android user agent. It would be nice to choose the agent to enable spotify. Url to open: https://open.spotify.com
In the next Beta 11 release, there will be ability to request desktop site, which should show Spotify player properly.
The option is available, but still not working for me with spotify.
Apparently, Spotify does some other checks that are not very consistent. It worked several times, but mostly it doesn’t. Will see if this can be changed for Spotify as well before main release.