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chromium/third_party/blink/web_tests/wpt_internal/web-share/share-arity.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="module">
import {callWithKeyDown, share_test} from './resources/share-test.js';
import {ShareError} from '/gen/third_party/blink/public/mojom/webshare/share_error.mojom.m.js';

share_test(mock => {
  mock.pushShareResult('the title', 'the message', 'data:the url',
                       ShareError.OK);
  return callWithKeyDown(() => {
    navigator.share({
        title: 'the title',
        text: 'the message',
        url: 'data:the url',
        unused: 'unexpected field'});
  });
}, 'extra ShareData field (extra field ignored)');

share_test(mock => {
  mock.pushShareResult('the title', 'the message', 'data:the url',
                       ShareError.OK);
  return callWithKeyDown(() => {
    navigator.share({
        title: 'the title',
        text: 'the message',
        url: 'data:the url'}, 'more than required');
  });
}, '2 arguments (extra argument ignored)');

</script>