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