prerender-while-prerender-outer.html

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<!DOCTYPE html>

<meta charset="utf-8">

<title>Prerender while prerendering test: outer prerendered page</title>

<script src="utils.js"></script>

<script type="module">

const params = new URLSearchParams(location.search);

const uid = params.get("uid");

const innerURL = `prerender-while-prerender-inner.html?uid=${uid}`;

startPrerendering(innerURL);

// Wait 5 seconds for any potential prerender to start and get to the point

// where it would send a message that would cause a failure.

await new Promise(r => setTimeout(r, 5_000));

document.addEventListener("prerenderingchange", () => {

  location.href = innerURL;

});

const channel = new PrerenderChannel("start-test", uid);

channel.postMessage("ready to start");

channel.close();

</script>