preload/modulepreload-as.html

<!doctype html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="modulepreload" href="resources/module1.js?empty-string" as="" data-as="">
<link rel="modulepreload" href="resources/module1.js?audio" as="audio" data-as="audio">
<link rel="modulepreload" href="resources/module1.js?audioworklet" as="audioworklet" data-as="audioworklet">
<link rel="modulepreload" href="resources/module1.js?document" as="document" data-as="document">
<link rel="modulepreload" href="resources/module1.js?embed" as="embed" data-as="embed">
<link rel="modulepreload" href="resources/module1.js?font" as="font" data-as="font">
<link rel="modulepreload" href="resources/module1.js?frame" as="frame" data-as="frame">
<link rel="modulepreload" href="resources/module1.js?iframe" as="iframe" data-as="iframe">
<link rel="modulepreload" href="resources/module1.js?image" as="image" data-as="image">
<link rel="modulepreload" href="resources/module1.js?json" as="json" data-as="json">
<link rel="modulepreload" href="resources/module1.js?manifest" as="manifest" data-as="manifest">
<link rel="modulepreload" href="resources/module1.js?object" as="object" data-as="object">
<link rel="modulepreload" href="resources/module1.js?paintworklet" as="paintworklet" data-as="paintworklet">
<link rel="modulepreload" href="resources/module1.js?report" as="report" data-as="report">
<link rel="modulepreload" href="resources/module1.js?script" as="script" data-as="script">
<link rel="modulepreload" href="resources/module1.js?serviceworker" as="serviceworker" data-as="serviceworker">
<link rel="modulepreload" href="resources/module1.js?sharedworker" as="sharedworker" data-as="sharedworker">
<link rel="modulepreload" href="resources/module1.js?style" as="style" data-as="style">
<link rel="modulepreload" href="resources/module1.js?track" as="track" data-as="track">
<link rel="modulepreload" href="resources/module1.js?video" as="video" data-as="video">
<link rel="modulepreload" href="resources/module1.js?webidentity" as="webidentity" data-as="webidentity">
<link rel="modulepreload" href="resources/module1.js?worker" as="worker" data-as="worker">
<link rel="modulepreload" href="resources/module1.js?xslt" as="xslt" data-as="xslt">
<link rel="modulepreload" href="resources/module1.js?fetch" as="fetch" data-as="fetch">
<link rel="modulepreload" href="resources/module1.js?invalid-dest" as="invalid-dest" data-as="invalid-dest">
<link rel="modulepreload" href="resources/module1.js?iMaGe" as="iMaGe" data-as="iMaGe">
<link rel="modulepreload" href="resources/module1.js?sCrIpT" as="sCrIpT" data-as="sCrIpT">
<body>
<script>
  // compared to modulepreload.html, this tests behavior when elements are
  // initially on an HTML page instead of being added by JS

  const scriptLikes = [
    'audioworklet',
    'paintworklet',
    'script',
    'serviceworker',
    'sharedworker',
    'worker',
  ];

  const goodAsValues = ['', 'invalid-dest', 'sCrIpT', ...scriptLikes];

  for (const link of document.querySelectorAll('link')) {
    const asValue = link.dataset.as; // don't depend on "as" attribute reflection
    const good = goodAsValues.includes(asValue);

    // promise tests are queued sequentially, so create the promise here to
    // ensure we don't miss the error event
    const promise = new Promise((resolve, reject) => {
      link.onload = good ? resolve : reject;
      link.onerror = good ? reject : resolve;
    });

    promise_test(() => promise.then(() => {
      const downloads = performance
        .getEntriesByName(new URL(link.href, location.href))
        .filter(entry => entry.transferSize > 0)
        .length;
      assert_equals(downloads, good ? 1 : 0);

    }), `Modulepreload with as="${asValue}"`);
  }
</script>