Yea, the pinch to zoom setting those links refer to is equal to hitting "Cmd +" or "Cmd -" on the keyboard (in Windows it would be Ctrl +). However this zoom doesn't really work properly on all websites, for example with both text and images.

What i was referring to was the "smooth" pinch to zoom like Safari and Chrome which works on any webpage (text + images). I don't know how to properly describe it, here's the example: http://i.imgur.com/AvLLbuy.gif

>I assume you're on a mac since you mention Safari?

Yea, a Macbook with a touchpad.