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<!doctype html>
<title>CSS test reference</title>
<meta charset="utf-8">
<style>
.test {
width: 1em;
height: 1em;
background-color: green;
display: inline-block;
}
#t1 {
font-size: 1vh;
}
#t2 {
font-size: 1vw;
}
#t3 {
font-size: 1vh;
}
#t4 {
font-size: 1vw;
}
</style>
<div class="test" id="t1"></div>
<div class="test" id="t2"></div>
<div class="test" id="t3"></div>
<div class="test" id="t4"></div>