<frameset cols="*"> <frame src="data:text/html, <script> function contextMenu() { document.getElementById('result').appendChild(document.createTextNode('PASS')); } </script> <body onmousedown='return false;' oncontextmenu='contextMenu(); return false;'> <p> Control-click (Mac) or right-click (Windows) below. The word %26ldquo;PASS%26rdquo; should appear. A contextual menu should not open. </p> <p id='result'></p> </body> "> </frameset>