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On Pc view, I have a 'mouseover' Event that when a viewer mouseovers a small image, a larger image appears. Obviously, with a mobile page this cannot be done, so am I correct in applying the 'on-touch' -start / 'on-touch end' event for my mobile/tablet pages?

Most touch devices handle hover as click.
But you can also touch events. However it becomes more complicated when a device support both mouse and touch. In that case, events may get mixed up (unrelated to WWB).