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Test Info:

<!doctype html>
<title>font-size depends on writing-mode</title>
<meta charset="utf-8">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="viewport-units-writing-mode-font-size-ref.html">
<style>
.test {
width: 1em;
height: 1em;
background-color: green;
display: inline-block;
}
#t1 {
writing-mode: vertical-lr;
font-size: 1vi;
}
#t2 {
writing-mode: vertical-lr;
font-size: 1vb;
}
#t3 {
font-size: 1vi;
writing-mode: vertical-lr;
}
#t4 {
font-size: 1vb;
writing-mode: vertical-lr;
}
</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>