<body>
<div>
I am 10px
<div>
I am 20px
<div>
I am 4px
<div>
I am 80px
<div>My parent is my base size, so because my parent is having 80px font size which is 1em so my font size is now 160px for 2em</div>
</div>
</div>
</div>
</div>
</body>
body { font-size:5px; }
div { font-size:2em; }
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