confusion understanding the fluid 2 column navigation layout

Posted by Jason Madux on Programmers See other posts from Programmers or by Jason Madux
Published on 2012-03-26T20:17:58Z Indexed on 2012/03/26 23:39 UTC
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I'm trying to understand the following cross-browser layout: http://matthewjamestaylor.com/blog/perfect-2-column-left-menu.htm but I'm having some confusion with some of its parts and there isn't enough information on the page or in the css comments to help me.

What is the purpose of the .colleft div? Why can't the 2 columns be directly under the .colmask container?
Why does the .colleft div have a right 75%? I don't understand its purpose/benefit.
Why don't the widths of .col1 and .col2 add up to 100%?
How was left:102% calculated for .col1 and left:6% for .col2? The comments for this are not very clear to me. How is it any different from not even specifiying a left/right css property?

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