Template:Float left/doc

Usage
This template floats text to the left without changing the alignment, and allows remaining text on page to wrap around the text.

This text is outside the floated span. yields This text is outside the floated span.

Obviously the effect is not striking without an example (see below)

With margins

 * 1st  The text to float to the left.
 * 2nd  sets the margin (gap) to the right of the floated text to the designated measure.
 * 3rd  sets the top and bottom margin of floated text to the designated measure

This text is outside the floated span. yields

This text is outside the floated span.

Either margin parameter may be used without the other: This text is outside the floated span. yields

This text is outside the floated span.

whereas This text is outside the floated span. yields

This text is outside the floated span.