JavaScript Timer Demo

This page does not make much sense, but you can't say it's not interactive :-))

As soon as Start was pressed, a script regularly checks whether the elements "Booh" and "Waah" exist in the document. When yes, the text log below will be green, when not and time runs out, it will be red. You can create and delete the elements by pressing the according buttons.

Maximum wait: Check interval: ms

All conditions must be true at same time

Elapsed: .... of .... ms