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Hmm doesn't appear on android mobile chrome. I just see a white square where the designer should appear.

The white square is the designer. Try double clicking on it.

(Double-)Tapping on the canvas doesn't seem to do anything in FF for Android.

For me it dlightly zooms in, so maybe the browser captured that action

Not working on my iPad either. Might not be mobile friendly.

Well it was made nearly 15 years ago.