Key Points
Most tags are descriptive in nature; in other words, they specify that text has a certain function, rather than specifying a certain way it should appear.
The exact formatting of descriptive tags is controlled by the browser defaults, by individual user customization, or by styles.
Headings are defined by tags <h1> through <h6>, from largest to smallest.
To make text bold, use the <b> tag; to make text italicized, use the <i> tag.
The tag for superscript is <sup>; the tag for subscript is <sub>.
Monospace text is text in which each character occupies the same amount of horizontal space; its opposite is proportional text.
By default, most Web text appears in a proportional font. To specify a monospace font, use the <tt>, <kbd>, <code>, or ...
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