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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/datastore/datatransferitemlist-remove.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>DataTransferItemList remove() method</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
"use strict";

// https://github.com/whatwg/html/issues/2925
test(() => {
  const dt = new DataTransfer();

  // Must not throw
  dt.items.remove(0);
  dt.items.remove(1);

  dt.items.add("data", "text/plain");

  // Must not throw
  dt.items.remove(1);
}, "remove()ing an out-of-bounds index does nothing");
</script>