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chromium/third_party/blink/web_tests/external/wpt/css/css-values/calc-ch-ex-lang-ref.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<style>
div {
  width: calc(1ex + 1ch + 1em);
  height: calc(1ex + 1ch + 1em);
  background: green;
}
</style>
<div></div>