Why has the zoom feature from the trackpad quit working?

Suddenly I cannot zoomin on screens by pinching out diagoanlly on the trackpad of my macbook air.  The proper selection is set in SETTINGS so it's not that.  I have tired on multiple web sites and it does not work (e.g., facebook news feed, twitter, wikipedia, etc.)  Any suggestions?

1. Reset PRAM.  http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".

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