See also the Netscape Navigator HTML Tag Reference:   Formatting Tags

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The <hr> tag stands for "Horizontal Rule" and is used to
produce a line on the screen. The width and height of the
line can be adjusted with attributes. Notice, though, that
unless told otherwise, the lines will be centered.

<hr>

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<hr noshade>

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<hr noshade width=400>

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<hr noshade width=50%>

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<hr noshade size=50>

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