Netscape Navigator 4.x plays better with CSS if the link to the style sheet specifies type="text/css1" instead of type="text/css":
<link rel="stylesheet" href="MyStyles.css" type="text/css1">
For example, tags <b>...</b> are ignored if the CSS entry for the class does not specify bold. If your HTML output will be viewed with Netscape Navigator 4.x, you can include the alternate link with this option:
; CSSLinkNS4 = No (default, required for CSS validation)
Unfortunately, this breaks the W3C CSS Validator, which claims there is no style sheet.