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Test Info:
<style>
:root { font-size: 10px }
body { font-size: 12px }
</style>
<body>Outside<iframe src=unit-rem-iframe-inside.html></body>
<style>
:root { font-size: 10px }
body { font-size: 12px }
</style>
<body>Outside<iframe src=unit-rem-iframe-inside.html></body>