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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-input-element/maxlength-number.html 

<!DOCTYPE html>
<title>input type=number maxlength</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<input type="number" maxlength="1">

<script>
  async_test(t => {
    let elem = document.getElementsByTagName("input")[0];
    test_driver.send_keys(elem, "1234")
      .then(t.step_func(() => {
         assert_equals(elem.value, "1234");
         t.done();
      }));
  }, "maxlength doesn't apply to input type=number");
</script>