1<!DOCTYPE html> 2<html> 3<head> 4<script> 5function runtest() { 6 var iframe = document.getElementById("iframe"); 7 iframe.src = "javascript:'A'"; 8 iframe.scrollTop; 9 iframe.src = "javascript:''"; 10} 11</script> 12</head> 13<body onload="runtest()"> 14<iframe id="iframe" style="width:1px;height:1px;"></iframe> 15</body> 16</html> 17 18