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Test Info:

<style>
body::first-letter {}
#c { display: initial }
* {
columns: 0;
contain: size layout;
writing-mode: vertical-rl
}
</style>
<script>
function go() {
a.size = "0"
var x = b.offsetWidth
document.title = "a"
}
</script>
<body onload=go()>
<title id="c">A</title>
<hr id="b">
<font id="a">