Long description for sample document tree diagram

This diagram illustrates a sample document tree.

The root node (HTML) is at the top. It has two children: HEAD and BODY. HEAD has one child: TITLE. BODY has three children: H1, P, and UL. The UL has 3 LI leaf nodes.

In outline form, one . indenting for each level, that gives:

HTML
.HEAD
..TITLE
.BODY
..H1
..P
..UL
...LI
...LI
...LI

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