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chromium/third_party/blink/web_tests/fast/forms/datetimelocal/invalid-value-console-messages.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1346508">

<input type=datetime-local>

<script>
  testRunner.dumpAsText();
  testRunner.setDumpConsoleMessages(true);
  const input = document.querySelector('input');
  // Forcing layout on the input is required to generate console warnings.
  input.getBoundingClientRect();

  console.log('These values should not generate console warnings.');
  input.value = '2022-07-22T06:44:31.200';
  input.value = '2022-07-22T06:44:31.20';
  input.value = '2022-07-22T06:44:31.2';
  input.value = '2022-07-22 06:44:31';
  input.value = '';

  console.log('These values should generate console warnings.');
  input.value = 'asdf';
  input.value = '2022-07-22T06:44:3';
  input.value = '2022-07-22T06:4';
</script>