File: data-transfer-file-list-change-reference-updates.html

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<!DOCTYPE html>
<meta charset=utf-8>
<title>Any JS reference DataTransfer.files should contain latest changes done to DataTransfer.items</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<input type=file multiple>
<script>
  test(() => {
    const dt = new DataTransfer();
    const filelist = dt.files;
    assert_equals(
      filelist.length, 0,
      'Initial filelist should be empty');
    dt.items.add(new File([0], 'test'));
    assert_equals(
      filelist.length, 1,
      'Filelist should reflect the changes done to items');
  }, 'expect changed contents');
</script>