Hello DavidGal,
Ok I understood. If we follow your approach, it works. So, sorry for making you waste time answering me.
But, clearly, I did not expect that. I expected that, automatically, the zoom is done by the software so as to make appear the zone.
But your logic does not correspond to what the naive user of the web expects. In today's world, one has to reach the goal in 1 click .... Without having to do anything else.
So, I think that others than me will remain perplexed by observing the apparent "not functioning" of the button.
Gilletarom