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chromium/third_party/blink/web_tests/fast/css/zoom-font-size.html 

<body style="font-size:16px">

All text below should be 32px tall.

<div style="zoom:200%">This text should be 32px tall.</div>
<div style="zoom:normal;font-size:32px">This text should be 32px tall.</div>
<div style="zoom:50%;font-size:64px">This text should be 32px tall.</div>
<div style="font-size:4px; zoom:400%; font-size:8px">This text should be 32px tall.</div>

</body>