chromium/third_party/blink/web_tests/http/tests/forms/form-submission-cancelable.html

<!DOCTYPE html>
<html>
<head>
<script src="/js-test-resources/js-test.js"></script>
</head>
<body>
<form method="GET" target="target" action="resources/form1.html">
      <input name="query" value="AAA" />
      <input type="submit" id="submitButton"/>
</form>
<form method="GET" target="target1" action="resources/form2.html">
      <input name="query1" value="AAA" />
      <input type="submit" id="submitButton1"/>
</form>
<iframe id="target" name="target"></iframe>
<iframe id="target1" name="target1"></iframe>
<script>
description('Test that form submit within onsubmit event handlers are not delayed and sends the form data when invoked');

document.forms[0].onsubmit = function (event) {
    document.forms[0].submit();
    document.forms[0].children.query.value = 'BBB';
    return false;
}

document.forms[1].onsubmit = function (event) {
    document.forms[1].submit();
    document.forms[1].children.query1.value = 'BBB';
    return true;
}

window.onload = function() {
    document.getElementById('target').onload = function(event) {
        // This should return back query AAA
        shouldBeEqualToString('event.target.contentWindow.location.search', '?query=AAA');
        document.getElementById('submitButton1').click();
    }

    document.getElementById('target1').onload = function(event) {
        // This should return back query BBB
        shouldBeEqualToString('event.target.contentWindow.location.search', '?query1=BBB');
        finishJSTest();
    }

    document.getElementById('submitButton').click();
}

if (window.testRunner)
    window.jsTestIsAsync = true;
</script>
</body>
</html>