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chromium/third_party/blink/web_tests/wpt_internal/web-share/share-url-relative.https.sub.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<base href="https://www.example.com/some/path.html">
<script type="module">
import {callWithKeyDown, share_test} from 'https://{{host}}:{{ports[https][0]}}/wpt_internal/web-share/resources/share-test.js';
import {ShareError} from 'https://{{host}}:{{ports[https][0]}}/gen/third_party/blink/public/mojom/webshare/share_error.mojom.m.js';

share_test(mock => {
  const url = 'foo';
  mock.pushShareResult('', '', 'https://www.example.com/some/foo',
                       ShareError.OK);
  return callWithKeyDown(() => navigator.share({url: url}));
}, 'successful share with a URL relative to document base URL');

</script>