css/css-text/text-autospace/text-autospace-vertical-combine-001.html

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
<link rel="match" href="text-autospace-vertical-combine-001-ref.html">
<style>
#container {
  writing-mode: vertical-rl;
  font-size: 20px;
}
.tcy {
  text-combine-upright: all;
}
</style>
<div id="container">
  <div>国<span class="tcy">XX</span>国</div>
  <div>国<span class="tcy">11</span>国</div>
</div>