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<html><head><style>.intro {background-color: yellow;}h1 {background-color: red;}</style></head><body><h1 class="intro">This is a heading</h1></body><!-- Mirrored from www.w3schools.com/css/tryit.asp?filename=trycss_specificity3 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 16:49:47 GMT --></html>