chromium/third_party/blink/manual_tests/submit-form-with-target-twice.html

<html>
<script>
function runTest() {
    var form = document.getElementById('f');
    
    form.submit();
    form.submit();
}
</script>
<form id="f" target="foo"><input></form>
<p>This tests that calling form.submit() twice in a row from JavaScript, on a form with a custom target and with at least one text field does not cause an assertion in a debug build of Safari.
</p>
<p>To test this, click the button below. A new window should open up and Safari should not assert.</p>
<button onclick="runTest()">Click Here</button>
</html>