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Chapter 2. Values > URIs
2.6. URIs
A URI value (<uri>) is a reference to a file such as a graphic or another style sheet. CSS defines a URI as relative to the style sheet that contains it. URI stands for Uniform Resource Identifier, which is the more recent name for URLs. (Technically, URLs are a subset of URIs.) In CSS, which was first defined when URIs were still called URLs, this means that references to URIs will actually appear in the form url(<uri>). Fun!
