Yeah, this was a genuine omission. I’ve now added the standard keyboard events to HTMLViewer:
KeyDown(keyName As String) As BooleanKeyUp(keyName As String)
Returning True from KeyDown marks the key as handled. Both events are available in Studio’s event picker and use the same key names and Keyboard state as the other controls.
It will be in the next release: https://feedback.objo.dev/feature/1375