single-download-preload.html | Explore in Territory

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<script>
  var t = async_test('Makes sure that preloaded resources are not downloaded again when used');
</script>
<link rel=preload href="resources/module1.js?single-download-preload" as=script crossorigin>
<link rel=preload href="resources/module1.mjs?single-download-preload" as=script crossorigin>

<body>
  <script src="resources/module1.js?single-download-preload" type="module" crossorigin></script>
  <script src="resources/module1.mjs?single-download-preload" type="module" crossorigin></script>
  <script>
    window.addEventListener("load", t.step_func(function () {
      verifyPreloadAndRTSupport();
      setTimeout(t.step_func(function () {
        verifyLoadedAndNoDoubleDownload("resources/module1.js?single-download-preload");
        verifyLoadedAndNoDoubleDownload("resources/module1.mjs?single-download-preload");
        t.done();
      }), 3000);
    }));
  </script>
  <span>PASS - this text is here just so that the browser will download the font.</span>

chromium/third_party/blink/web_tests/wpt_internal/preload/single-download-preload.html