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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<style>
@font-face {
font-family: test;
src: url(../fonts/NotoSansCJKjp-Regular.subset.otf);
}
body {
font-family: test, serif;
line-height: 2em;
}
p {
margin: 1em;
}
span {
display: inline-block;
inline-size: 9em; /* length of 9 standard CJK chars */
}
.v {
writing-mode: vertical-rl;
}
.green {
color: green;
background: green;
}
.overlay {
position: relative;
inset-block-start: -3em;
}
</style>
</head>
<body>
There should be no red:
<div>
<p><span> </p>
<p class="overlay"><span class="green"> </p>
<p><span> </p>
<p class="overlay"><span class="green"> </p>
</div>
<div class="v">
<p><span> </p>
<p class="overlay"><span class="green"> </p>
<p><span> </p>
<p class="overlay"><span class="green"> </p>
</div>