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<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<body>
<script>
"use strict";
promise_test(async t => {
const sentinelIframe = await setupSentinelIframe(t);
const startingHistoryLength = history.length;
const code = `
const form = document.createElement("form");
form.action = "/common/blank.html";
const input = document.createElement("input");
input.type = "hidden";
input.name = "thereplacement";
form.append(input);
const button = document.createElement("button");
button.type = "submit";
form.append(button);
document.currentScript.before(form);
button.click();
`;
const startURL = "resources/code-injector.html?pipe=sub(none)&code=" + encodeURIComponent(code);
const afterReplacementURL = "/common/blank.html?thereplacement=";
const iframe = insertIframe(t, startURL);
assert_equals(history.length, startingHistoryLength, "Inserting the under-test iframe must not change history.length");
await waitForLoad(t, iframe, afterReplacementURL);
assert_equals(history.length, startingHistoryLength, "history.length must not change after waiting for the replacement");
await checkSentinelIframe(t, sentinelIframe);
assert_equals(history.length, startingHistoryLength, "history.length must not change after checking the sentinel iframe");
}, "Replace before load, triggered by submitButton.click()");
</script>
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