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<html><body><h1>The abbr element + the dfn element</h1><p><dfn><abbr title="Cascading Style Sheets">CSS</abbr></dfn> is a language that describes the style of an HTML document.</p></body></html><html><body><h1>The abbr element + the dfn element</h1><p><dfn><abbr title="Cascading Style Sheets">CSS</abbr></dfn> is a language that describes the style of an HTML document.</p></body></html>