<!doctype html> <head> <title>CSS Test (Conditional Rules): Support for simple passing conditions in @media</title> <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"> <link rel="help" href="https://www.w3.org/TR/css-conditional-3/#use"> <link rel="help" href="https://www.w3.org/TR/css-conditional-3/#at-media"> <link rel="match" href="at-supports-001-ref.html"> <meta name="assert" content="Test passes if rules under a true @media condition are applied in place."> <style> div { background: red; height: 25px; width: 100px; } @media all { .test1 { background: green; } .test2 { background: red; } } .test2 { background: green; } @media not unknown { .test3 { background: green; } .test4 { background: red; } } .test4 { background: green; } </style> </head> <body> <p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p> <div class="test1"></div> <div class="test2"></div> <div class="test3"></div> <div class="test4"></div> </body> </html>