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<html style="font-size:18px">
<head>
<script>
if (window.internals)
    window.internals.setTextZoomFactor(2)
</script>
</head>
<body>
<p style="-webkit-text-zoom:reset">This text should not zoom</p>
<p style="-webkit-text-zoom:reset; font-size:24px">This text should not zoom</p>
<p style="-webkit-text-zoom:reset; font-size:inherit">This text should not zoom</p>
</body>
</html>