<!DOCTYPE html>
<html>
<head>
<title>This tests that the display ID of the primary screen is valid.</title>
<script>
function log(msg)
{
    document.getElementById('console').appendChild(document.createTextNode(msg + "\n"));
}

function onload()
{
    if (window.testRunner)
        testRunner.dumpAsText();
    if (window.internals.primaryScreenDisplayID())
        log("PASS: Valid primary screen display ID.");
    else
        log("FAIL: Invalid primary screen display ID.");
}
</script>
</head>
<body onLoad="onload()">
<pre id="console"></pre>
</body>
</html>