<!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 = `
window.onload = () => { window.onloadFired = true; };
`;
const startURL = "resources/slow-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");
const absoluteStartURL = (new URL(startURL, location.href)).href;
while (true) {
if (iframe.contentWindow.location.href === absoluteStartURL) {
break;
}
await new Promise(r => setTimeout(r, 0));
}
assert_equals(iframe.contentWindow.location.href, (new URL(startURL, location.href)).href, "Iframe must be navigated away from the initial about:blank document");
assert_equals(iframe.contentWindow.onloadFired, undefined, "onload must not yet have fired");
iframe.src = afterReplacementURL;
await checkSentinelIframe(t, sentinelIframe);
assert_equals(history.length, startingHistoryLength, "history.length must not change after checking the sentinel iframe");
}, "Replace before load, triggered by setting iframeElement.src");
</script>
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