how do I know if a document is in css or css3?

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how do I know if a document is in css or css3?

Computer Science
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css3 is just a new version of css. It just has more properties. http://www.w3schools.com/cssref/default.asp On the right it will tell you if the property is version 1 or version 3
Most people seem to suggest using a script to detect if the browser supports css3.
I don't get it...does the browser determine which version of css?

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What the file contains determines if it is CSS1, 3, etc. However, not all browsers support 3. So what people are doing is using a script to detect what the browser supports, then change the page content based on those results.
ok...so does that mean that the only thing that determines if the file is a css3 file would be if the file contained some new features that were added in css3?
From what I have read so far, yes.

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