css 框架 grid的困惑 Using Nesting Grids

不懂他网格如何原理
\Using Nesting Grids

YUI Grids CSS provides a system for subdividing sections of your page with nestable grids. Use this technique to easily create complex layouts that go beyond the two column layouts offered by the template presets. The picture below shows, for example, how a two-column grid is "nested" within the main block:


The Basic Idea

The basic idea is that "grids" are holders of "units". The standard grid holder is a div with a class of "yui-g" (g is for grid). The contained units are divs with a "yui-u" class (u is for unit). Except in special cases we'll examine later, a grid holds two units and instructs each unit to take up half the available space. Here's what a basic nested two-unit grid looks like:
HTML code:
1 ...
2 <div id="yui-main">
3 <div class="yui-b">
4 <div class="yui-g">
5 <div class="yui-u first"></div>
6 <div class="yui-u"></div>
7 </div>
8 </div>
9 </div>
10 ...

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... <div id="yui-main"> <div class="yui-b"> <div class="yui