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chromium/third_party/blink/web_tests/external/wpt/css/css-viewport/zoom/font-size-ref.html 

<!DOCTYPE html>
<title>CSS Test reference</title>
<div style="font-size: 12px">
  12px text
</div>

<hr>

<div style="font-size: 24px;">
  12px zoomed text
</div>

<hr>

<div style="font-size: 12px">
  <div style="font-size: 24px">
    12px zoomed inherited text
  </div>
</div>