<meta charset="utf-8">

<title>CSS Values and Units Test: the ch 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-3/#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/ch-unit-002-ref.html">

<meta name="assert" content="In vertical upright, the ch unit is equal to the used vertical 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: upright;

}

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>

<div><span>00000</span></div>

<div><span></span>00000</div>