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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Values and Units Test: the ic unit in vertical orientation</title>
+<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#font-relative-lengths">
+<link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#block-flow">
+<link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#text-orientation">
+<link rel="match" href="reference/ic-unit-001-ref.html">
+<meta name="assert" content="In vertical sideways, the ic unit is equal to the used horizontal advance measure of the 水 (CJK water ideograph, U+6C34) glyph found in the font used to render it.">
+<style>
+@font-face {
+ font-family: IcTestFullWidth;
+ src: url(resources/IcTestFullWidth.woff2);
+}
+
+span {
+ font: 20px IcTestFullWidth;
+ background: green;
+ color: green;
+ left: 0; right: 0;
+ position: absolute;
+}
+
+div {
+ font: 20px IcTestFullWidth;
+ background: red;
+ color: red;
+ position: relative;
+ height: 5ic;
+ width: 10ic;
+ writing-mode: vertical-rl;
+ text-orientation: sideways;
+}
+
+div + div {
+ height: auto;
+}
+
+div + div span {
+ height: 5ic;
+}
+</style>
+<body>
+ <p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+ <div><span>水水水水水</span></div>
+ <div><span></span>水水水水水</div>
+</body>