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Works on my Android. You do have to press the "start demo" button at the bottom.

Not on iOS Safari for me.

There's a start demo button at the bottom. Worked on my iPhone on Safari

I could only get the basic beat after tapping Start Demo on my iPad. I couldn't mix in with the selection buttons :( I could see some toggled on, couldn't toggle them off and vice-versa, whether the demo was started or stopped.

Those aren't toggles. They are just the elements that get animated during the demo. Each one is a demo of the CSS to the right of them. The ones that are colors are just that way because the demo won't work well with empty shapes.

I made the same mistake.

Working on Firefox Nightly on Android for me.