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<!doctype html>
<form>
<input type="text" name="name" value="value">
<input type="submit" value="Submit">
</form>
<script>
"use strict";
if (window.location.search.startsWith("?name=value")) {
// The action pointed to ourself, so the form submitted something
window.parent.success(window.location.href);
} else {
const form = document.querySelector("form");
form.submit();
}
</script>
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