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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-input-element/hidden-charset-case-sensitive.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://html.spec.whatwg.org/#hidden-state-(type=hidden):attr-fe-name-charset">
<meta name="assert" content="special input@name value “_charset_” is case-sensitive">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<form target="child" method="GET" action="hidden-charset-case-sensitive-child.html">
  <input type="hidden" name="_charset_">
  <input type="hidden" name="_CHARSET_">
  <input type="hidden" name="_ChArSeT_">
  <input type="hidden" name="_charſet_">
</form>
<iframe name="child"></iframe>
<script>
// #attr-fe-name-charset only affects form submission, so we need to do that
async_test(function() {
  // we use a message rather than the iframe’s load event to avoid dealing with
  // spurious load events that some browsers dispatch on the initial about:blank
  addEventListener("message", this.step_func_done(event => {
    const params = new URL(event.data).searchParams;

    assert_equals(params.get("_charset_"), "UTF-8", "lowercase valid");
    assert_equals(params.get("_CHARSET_"), "UTF-8", "uppercase valid");
    assert_equals(params.get("_ChArSeT_"), "UTF-8", "mixed case invalid");
    assert_equals(params.get("_charſet_"), "", "non-ASCII invalid");
  }));

  document.querySelector("form").submit();
}, "keyword _charset_");
</script>