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<!DOCTYPE html>
<html>
<head>
<style>
.a {
font-size: 20px;
}
.b {
font-size: 1.3em;
}
</style>
</head>
<body>
<div class="a">
1. what will be the font size here ?
<div class="b">
2. what will be the font size here ?
<div class="b">
3. what will be the font size here ?
</div>
</div>
</div>
</body>
</html>