Android: html touch events?

I tested some html examples with webviewer. Most things work fine.
Drawing, Buttons, Alerts, Sprite movement, etc.
On IOS everything works. But on Android the html examples with webviewer do not react on inputs on touch screen (e.g. button or touch events)

Does this example work for you in WebViewer?

Seems to be too complex. For testing I prefer examples with only one html file.