<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
/* html{
font-size: 20px;
}*/
/* body{
font-size: 20px;
}*/
.em{
background: red;
width:10em;
height:10em;
font-size: 20px;
}
.rem{
background: blue;
width:10rem;
height:10rem;
font-size: 20px;
}
</style>
</head>
<body>
em
<div class="em">
</div>
rem root element
<div class="rem">
</div>
</body>
</html>
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