Another important tool for working with increasingly complex CSS is the Web Developer plug-in for the Firefox browser that is freely available from Chris Pedrick. Web developers have pretty much standardized on Firefox as their browser because of its support for web development. You can find and install the Web Developer plug-in at http://addons.mozilla.org/.
When the Web Developer plug-in is installed, you will have an additional toolbar when you start Firefox. There are many useful options in this toolbar. The first one we will use is under Outline→Outline Block Elements.† When you enable the outlining of block elements, you can see the structure of your web page, including which elements are contained within other elements. If you have made a mistake in the structure or nesting of your HTML, you may be able to quickly identify and fix the problem just by looking over the block elements.
from 'using google app engine'
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