Why the Parallel layout?
We have proved that the nested layout could build liquid layouts up to 5 columns. The more columns, the more wrapper div tags.
Sometimes we may not like many extra div tags. The parallel layout is the solution.
The same as the nested design, we use left instead of margin to seperate columns.
Just drag the sliders to adjust the width of the left and right columns. This tool is keeping upgrading until it becomes a real WYSISWG HTML editor.