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The HTML5 outlining algorithm is a great way to check the structure of your document to make sure that it's understandable by scripts, search engines, and other automated processes. The outlining algorithm uses the sectioning content model to discover the sections of your document and then uses of set rules to create an outline. The Mozilla organization maintains a page with an excellent description of the outlining algorithm. For example, if we take the relevant structure from the scissors page, we could run it through the outlining algorithm to produce this outline.
There are a few resources available to produce outlines from your pages. The h5o project on Google code has collected a few, including a Chrome extension. There is also a public outliner script available html5.org. We will experiment with a few of these tools in the next movie.
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