layout/reftests/css-valuesandunits/unit-rem-ref.html


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<style>
:root { font-size: 20px }
body { font-size: 25px }
div {
  font-size: 30px;
  width: 300px;
}
#a {
  border-bottom: 1px solid #f00;
}
</style>

<body>Level 1<div id=a>Level 2<div id=b>Level 3</div></div></body>