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chromium/third_party/blink/web_tests/wpt_internal/css/css-fonts/font-size-ex-ch-with-zoom.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://crbug.com/408777">
<link rel="match" href="font-size-ex-ch-with-zoom-ref.html" />

<title>Maintain correct font-size in ex and ch with zoom</title>

<body style="margin: 0; padding: 0;">
  <div style="font-size: 2ex">size should be 6ex</div>
  <div style="font-size: 2ch">size should be 6ch</div>
</body>

<script>
  if (window.testRunner) {
    testRunner.setPageZoomFactor(3);
  }
</script>