HTML 4.01 in Netscape and Explorer: Alignment, Font Styles, and Horizontal Rules
All the elements and attributes described in this section of the specification are supported by both Netscape and Explorer, with only a couple of changes:
Table cells, as described in the section on tables, do not accept an attribute value of align=justify.
Explorer recognizes a color attribute to the hr element that gives a color for the horizontal rule, which is especially handy for pages with black backgrounds, which usually render rules invisible.
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Created: Mar. 12, 1998
Revised: November 15, 2004