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Wolfram Alpha provides HTML element hierarchy plots for web sites.

For an example, enter a popular website, like stackoverflow.com into the field:

http://www.wolframalpha.com/input/?i=stackoverflow.com

And the generated HTML element graphic at the bottom of the results may look like this:

html hierarchy of stackoverflow.com

What criteria is used to determine the length and direction of the lines which connect the different elements?

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This is statistics, so you might get luckier asking on stats.stackexchange.com. I think they are purely arbitrary in this case, but I might be wrong. –  Alex Nov 22 '11 at 5:55
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