blob: 5c3ed54659282483827c6055d961df0df6cbaa04 [file] [log] [blame]
<?php
header('Link: <http://127.0.0.1:8000/resources/square.png?large>; rel=preload; as=image; imagesrcset="http://127.0.0.1:8000/resources/square.png?small 300w, http://127.0.0.1:8000/resources/square.png?large 600w"; imagesizes="(min-width: 300px) and (max-width: 300px) 300px, 600px"', false);
header('Link: <http://127.0.0.1:8000/resources/square.png?base>; rel=preload; as=image; imagesrcset="http://127.0.0.1:8000/resources/square.png?299 299w, http://127.0.0.1:8000/resources/square.png?300 300w, http://127.0.0.1:8000/resources/square.png?301 301w"; imagesizes="100vw"', false);
?>
<!DOCTYPE html>
<meta name="viewport" content="width=300">
<script>
const numPreloads = 2;
let loaded = [];
function checkPreloads(perf) {
for (let e of perf.getEntriesByType('resource')) {
let q = e.name.indexOf("?");
if (q >= 0)
loaded.push(e.name.substr(q + 1));
}
if (loaded.length >= numPreloads)
window.opener.postMessage(loaded, "*");
}
let observer = new PerformanceObserver(checkPreloads);
observer.observe({entryTypes: ["resource"]});
checkPreloads(performance);
</script>