<!doctype html> <title>CSS Test Reference</title> <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> <link rel="author" title="Mozilla" href="https://mozilla.org"> <style> #test { background-color: green; width: 200px; height: 200px; } </style> <p>Test passes if there is a green 200px times 200px square.</p> <div id="test"></div>