06-basic-visual-formatting/sizing-elements-width.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Sizing elements’ width</title>
<link rel="stylesheet" type="text/css" href="c/basic.css">
<style type="text/css">
.arena {display: flex; align-items: start;}
body {width: auto; font: 1.25em/1.25 Calibri, Arial, Helvetica, sans-serif;}
[id^="cb"] {margin: 4em 0.25em 0; position: relative;}
[id^="cb"] p {background: silver;}
[id^="cb"] code {font-size: 95%;}
</style>
<style type="text/css">
[id^="cb"] {border: 1px solid;}  /* "cb" for "containing block" */
p {width: 25ch;}
#cb1 {writing-mode: horizontal-tb;}
#cb2 {writing-mode: vertical-rl;}
#cb3 {writing-mode: vertical-lr;}
 </style>
</head>
<body>

<main class="arena">

<div id="cb1"><p>This is a paragraph with some text.  Its width (<em>not</em> inline-axis) has been set to <code>25ch</code>.</em></p></div>
<div id="cb2"><p>This is a paragraph with some text.  Its width (<em>not</em> inline-axis) has been set to <code>25ch</code>.</em></p></div>
<div id="cb3"><p>This is a paragraph with some text.  Its width (<em>not</em> inline-axis) has been set to <code>25ch</code>.</em></p></div>
</main>

</body>
</html>