chromium/third_party/blink/web_tests/fast/dom/HTMLAnchorElement/anchor-download-unset.html

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
</script>
</head>
<body>
<a id="blob-url" download>Blob URL</a>
<script>
function click(elmt)
{
    if (!window.eventSender) {
        alert('Click the link to run the test.');
        return;
    }
    eventSender.mouseMoveTo(elmt.offsetLeft + 5, elmt.offsetTop + 5);
    eventSender.mouseDown();
    eventSender.mouseUp();
}

function runTest()
{
    var string = "<!doctype html><html><head><title>Title</title><script>if (window.testRunner) testRunner.dumpAsText(); </" + "script></head><body>PASS</body><script>if (window.testRunner) testRunner.notifyDone();</scr" + "ipt></html>";
    var blob = new Blob([string], {type: "text/html"});
    var link = document.getElementById("blob-url");
    link.href = window.URL.createObjectURL(blob);
    link.removeAttribute('download');
    click(link);
}
runTest();
</script>
</body>
</html>