how to iphone tips safari Zoom a column

Zoom a column. You can zoom text columns as well as pictures. Double-tap on the column to fit it to the display. Double-tap again to return out of the zoom. Not only does Safari zoom block-quoted text independently of regular text but if you move your finger after the first double-tap-to-fit, it interprets the next double-tap as a re-center page command rather than a return-to-previous-zoom. Smart.