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chromium/third_party/blink/web_tests/svg/custom/zoomed-letter-spacing.html 

<!doctype html>
<body style="zoom:2">
  <p>The letter spacing should be identical:</p>
  <div style="letter-spacing: 10px">
    <svg width="100" height="50"><text x="0" y="20">123</text></svg><br>
    <svg style="letter-spacing: 10px" width="100" height="50"><text x="0" y="20">123</text></svg>
  </div>
</body>