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chromium/third_party/blink/web_tests/external/wpt/encoding/sniffing.html 

<!doctype html>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<title>No (UTF-8) sniffing allowed</title>
<div id=log></div>
<div id=content>€€ Hello World! €€</div>
<script>
test(() => {
  assert_equals(document.getElementById("content").textContent, "\u00C2\u20AC\u00C2\u20AC Hello World! \u00C2\u20AC\u00C2\u20AC");
  assert_equals(document.characterSet, "windows-1252");
});
</script>