File: cross-origin-iframe-src-prerender.html

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<!doctype html>
<body>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script>
const prerenderChannel = new PrerenderChannel('iframe-channel');

const initial_prerendering = document.prerendering;

document.addEventListener('prerenderingchange', () => {
  prerenderChannel.postMessage('document.prerendering changes to '  +
    `${document.prerendering} from ${initial_prerendering}`, '*');
  prerenderChannel.close();
});

prerenderChannel.postMessage('onload');
</script>
foobar
</body>