Use of the class attribute in an HTML document

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<html> <head> <style type="text/css"> h1.intro {color:blue;} p.important {color:green;} </style> </head> <body> <h1 class="intro">Header 1</h1> <p>A paragraph.</p> <p class="important">Note that this is an important paragraph. :)</p> </body> </html>
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