modulepreload-sri.html

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This WPT test may be referenced by the following Test IDs:
- /preload/modulepreload-sri.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>modulepreload with an invalid integrity does not poison a later import</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

<script>

  // A modulepreload whose integrity check fails is a fetch error, which per the

  // HTML spec is not cached in the module map. A later <script type=module> for

  // the same URL that has no integrity requirement must therefore be able to

  // fetch it again and load successfully.

  // https://html.spec.whatwg.org/#fetch-a-single-module-script

//

  // The <script> is only inserted after the modulepreload has finished, so the

  // two never join a single in-flight fetch.

  promise_test(async () => {

    const link = document.createElement('link');

    link.rel = 'modulepreload';

    link.href = 'resources/module1.js';

    link.integrity = 'sha384-invalid';

    await new Promise((resolve, reject) => {

      link.onload = () => reject(new Error('modulepreload should have failed its integrity check'));

      link.onerror = resolve;

      document.head.appendChild(link);

});

    const script = document.createElement('script');

    script.type = 'module';

    script.src = 'resources/module1.js';

    await new Promise((resolve, reject) => {

      script.onload = resolve;

      script.onerror = () => reject(new Error('script should have loaded'));

      document.body.appendChild(script);

});

  }, "A module script should load even if an earlier modulepreload for the same URL failed its integrity check");

</script>