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chromium/third_party/blink/web_tests/external/wpt/shared-storage/shared-storage-writable-img-idl-attribute-included-bytes.tentative.https.sub.html 

<!doctype html>
<body>
  <script src=/resources/testharness.js></script>
  <script src=/resources/testharnessreport.js></script>
  <script src=/common/utils.js></script>
  <script src=/fenced-frame/resources/utils.js></script>
  <script src=/shared-storage/resources/util.js></script>
  <script src=/shared-storage/resources/util.sub.js></script>
  <script>
    const sameOrigin = new URL("", location.href).origin;
    const crossOrigin = 'https://{{domains[www]}}:{{ports[https][0]}}';

    promise_test(async t => {
      await loadSharedStorageImage({
        key: ':8J+YgA==:', value: ':4p2k:',
        hasSharedStorageWritableAttribute: true,
        isSameOrigin: true,
      });

      await verifyKeyValueForOrigin(String.fromCharCode(0xD83D, 0xDE00),
                                    String.fromCharCode(0x2764),
                                    sameOrigin);
      await deleteKeyForOrigin(String.fromCharCode(0xD83D, 0xDE00), sameOrigin);
    }, 'test <img sharedstoragewritable src=[url]> via JS for same origin img with bytestring');

    promise_test(async t => {
      await loadSharedStorageImage({
        key: ':8J+MjQ==:', value: ':8J+PgQ==:',
        hasSharedStorageWritableAttribute: true,
        isSameOrigin: false,
      });

      await verifyKeyValueForOrigin(String.fromCharCode(0xD83C, 0xDF0D),
                                    String.fromCharCode(0xD83C, 0xDFC1),
                                    crossOrigin);
      await deleteKeyForOrigin(String.fromCharCode(0xD83C, 0xDF0D), crossOrigin);
    }, 'test <img sharedstoragewritable src=[url]> via JS for cross origin img with bytestring');
  </script>
</body>