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Sometimes, when I am moving the mouse cursor on my Mac Mini, Safari zooms in the page. I checked the mouse settings, and the only gesture that would cause that should be the double-tap, which is not what I am doing.
I have not noticed the same behavior with other browsers, or applications.

screenshot

What is causing Safari to randomly zoom in the page I am viewing?

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Same question. I like this feature but cannot seem to reproduce it. Apple Geniuses couldn't either. It is some bug that I love but would like to use it on demand. –  Monster Truck Jul 25 '12 at 2:31
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1 Answer

up vote 3 down vote accepted

It appears not the be the case for the Magic Mouse, but with the trackpad, there is a pinch to zoom gesture also. If another finger were touching the trackpad, one finger's movement could be interpreted as a pinch.

enter image description here

Another option is that some part of your hand is coming in contact with the mouse surface and is being interpreted as a double tap. If you turn off the double tap gesture in System Preferences, does the problem persist?

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Disabling the smart zoom worked. The mouse must be very sensible, even if I cannot enable the smart zoom so easily, when I need. –  kiamlaluno Oct 22 '11 at 19:10
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