Now that most of the browsers out there are compliant with XHTML 1 or HTML 4.1, you'd think we'd be off the hook. But of course, as Web developers our lives are never dull. Now you need to worry about CSS. CSS2 and even CSS 3 properties are floating around out there, and while they usually won't break your Web pages, you should probably know which properties are safe and which aren't.

• Safe CSS

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