<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h1>Test page</h1>
<p>Hello!</p>
<script type="text/javascript">
var dummyscript = document.createElement('script');
// Register error function where the file does not exist.
dummyscript.onerror = function() {
if (dummyscript.onerror)
alert("The file does not exist.");
}
// Append some random data to the file name so that the browser cache doesn't serve an old result.
dummyscript.src = "file:///C:/Temp/testfile?" + new Date().getTime() + Math.floor(Math.random() * 1000000);
// Load dummy script
document.body.appendChild(dummyscript);
</script>
</body>
</html>
But, the web browser displays "Not allowed to load local resource: file:///C:/Temp/testfile?~~~~~~".