chromium/third_party/blink/web_tests/http/tests/mime/png-image-with-x-png-mime-type.html

<!DOCTYPE html>
<html>
<body>
<iframe scrolling=no width=300 height=300></iframe>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

function loadImage()
{
    return "http://127.0.0.1:8000/resources/load-and-stall.php";
}

function xPngImage()
{
    return "?name=../../../images/resources/gracehopper.png&mimeType=" + encodeURIComponent("image/x-png");
}

function testDone()
{
    window.testRunner && testRunner.notifyDone();
}

function runTests()
{
    var _newLoc = loadImage() + xPngImage();
    document.querySelector('iframe').src = _newLoc;
    setTimeout(testDone, 500);
}

setTimeout(function(){runTests();},0);
</script>
</body>
</html>