This tests whether we correct parse various space characters in the sandbox attribute.<br>
<script>
var testCases = [
    [' ', 'PASS: Space is a delimiter character.'],
    ['\t', 'PASS: Tab is a delimiter.'],
    ['x', 'FAIL: x is not a delimiter.'],
    ['\r', 'PASS: Return is a delimiter.'],
    ['\n', 'PASS: Newline is a delimiter.'],
    ['\v', 'FAIL: Vertical tab is not a delimiter.'],
    ['\f', 'PASS: Form feed is a delimiter.'],
]

function next() {
    if (testCases.length) {
        var testCase = testCases.pop();
        testCharacter.apply(null, testCase);
        return;
    }

    if (window.testRunner)
        testRunner.notifyDone();
}

function testCharacter(possibleDelimiter, message) {
    var policy = "allow-modals allow-scripts" + possibleDelimiter + "allow-forms";
    var iframe = document.createElement('iframe');
    iframe.sandbox = policy;
    iframe.src = "data:text/html,<script>console.log('" + message + "');<\/script>";
    iframe.onload = next;
    document.body.appendChild(iframe);
}

if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

next();

</script>