Firebug还是一个优化css样式和Web页面外观的优秀工具。
Firebug is also a great tool for tuning CSS styles and the look and feel of a Web page.
深度1表示保存的页面包括页面的图片和样式信息。
A depth of 1 saves the page, including its graphics and style information.
顶部的规则，然后是其下的规则，都应用到页面和样式表上。
Rules at the top are applied, then rules below them, and on through your page and stylesheet.
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