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The site <a href="http://www.quirksmode.org/compatibility.html" rel="ugc">http://www.quirksmode.org/compatibility.html</a>&nbsp;has tables that show differences in browser implementations. &nbsp;It doesn't directly address 'compatibility' for reasons above but you can often find out if a particular element is not supported by a particular browser.
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The site http://www.quirksmode.org/compatibility.html [http://www.quirksmode.org/compatibility.html] has tables that show differences in browser implementations.  It doesn't directly address 'compatibility' for reasons above but you can often find out if a particular element is not supported by a particular browser.

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Maybe this is pie in the sky, but are there any tools for free or for under $50 that will tell you or help you write CSS that is cross-browser compatible, or help you identify CSS properties that are likely to work in some browsers and break in others?
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Maybe this is pie in the sky, but are there any tools for free or for under $50 that will tell you or help you write CSS that is cross-browser compatible, or help you identify CSS properties that are likely to work in some browsers and break in others?

CSS behavior in different browsers

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.