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<!DOCTYPE html>
<h1>navigation-unload-form-submit-1.html</h1>
<script>
let isSubmit = false;
window.unload = function () {
window.location = 'is-Submit' + isSubmit;
}
function setIsSubmit() {
isSubmit = true;
}
</script>
<form onsubmit="setIsSubmit" action="navigation-unload-form-submit-2.html">
<input type="submit">
</form>
<script>
parent.finishedLoading();
</script>