About Horizontal Lines
The simple, straight lines running horizontally across many Web pages (see Figure 22.1) have always been known in Web parlance as horizontal rules because they're created by the HTML tag <HR>—HR for horizontal rule.
Figure 22.1. Horizontal lines are easy to create in various widths and thicknesses and offer an easy, attractive way to organize a page.
Netscape apparently thinks that the term rule is confusing, so in Composer it's a horizontal line. No matter. Rules are made to be broken, or lines, or something like that.
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