fetch-blob.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/fetch-blob.html?target_hint=_blank - WPT Dashboard Interop Dashboard
- /speculation-rules/prerender/fetch-blob.html?target_hint=_self - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Same-origin prerendering can access blobs</title>

<meta name="variant" content="?target_hint=_self">

<meta name="variant" content="?target_hint=_blank">

<meta name="timeout" content="long">

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

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

<script src="/common/utils.js"></script>

<script src="/common/dispatcher/dispatcher.js"></script>

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

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

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {

  const opt = {};

  const init_opt = {};

  const rule_extras = {'target_hint': getTargetHint()};

  const {exec} = await create_prerendered_page(t, opt, init_opt, rule_extras);

  const result = await exec(async () => {

    const blob = await (await fetch('cache.txt')).blob();

    const reader = new FileReader();

    reader.readAsText(blob);

    return new Promise(function(resolve, reject) {

      reader.onload = () => resolve(reader.result);

      reader.onerror = () => reject(reader.error);

});

});

  const expected = "Hello, Prerender API!";

  // Start prerendering a page that attempts to access the blob.

  assert_equals(

    result, expected,

    'prerendering page should be able to read from blobs.');

}, 'prerendering page should be able to access blobs');

</script>