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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Values and Units Test: support for the ch unit</title>
<link rel="author" title="Florian Rivoal" href="">
<link rel="help" href="">
<link rel="match" href="reference/ch-unit-001-ref.html">
<meta name="assert" content="In vertical mixed, The ch unit is equal to the used horizontal advance measure of the 0 (ZERO, U+0030) glyph found in the font used to render it.">
span {
background: green;
color: green;
left: 0; right: 0;
position: absolute;
div {
background: red;
color: red;
position: relative;
height: 5ch;
width: 10ch;
writing-mode: vertical-rl;
text-orientation: mixed;
div + div {
height: auto;
div + div span {
height: 5ch;
<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>