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<!doctype html>
<meta charset="utf-8">
<title>History back page B</title>
<body>
<script>
"use strict";
document.body.textContent = "Page B";
window.addEventListener("load", () => {
if (window.parent) {
window.parent.postMessage({ type: "loaded_b" }, "*");
}
});
</script>
</body>