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Formatting

<h1> ,<h2>,<h3>,<h4>,<h5> and <h6> define headings, with h1 being the biggest. Using headings allows engines to produce smarter search results. Only one <h1> should be used per page.

<hgroup> groups heading tags.

<b>:bold.

<i>:italic

<u>:underline

<sub>: subscript

<sup>:superscript

<mark>: highlights

<small>:small font; side information

<s>:strikethrough

<q>:short quotation without paragraph breaks (unlike long quotation in <blockquote>)
...... cite=URL

<del>:deleted text
...... cite=URL that explains the change
...... datetime=date and time of deletion

<ins>: inserted text
...... cite=URL that explains the change
...... datetime=date and time of deletion

<pre>: preformatted text, ie. fixed-width font. The space inside the content here does not collapse, which can be important when there is a need to indent or space out the text.