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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="http://florian.rivoal.net/">
+<link rel="help" href="https://drafts.csswg.org/css-values-3/#font-relative-lengths">
+<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.">
+<style>
+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;
+}
+</style>
+<body>
+ <p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+ <div><span>00000</span></div>
+ <div><span></span>00000</div>
+</body>