<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Values and Units Test: support for the ex unit</title> <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au"> <link rel="help" href="https://drafts.csswg.org/css-values-3/#font-relative-lengths"> <link rel="match" href="reference/ex-unit-002-ref.html"> <meta name="assert" content="The ex unit equals the x-height of the first available font if it has reliable metrics for the x-height."> <style> @font-face { font-family: ExTest; src: url(resources/ExTest.woff); } div { height: 10px; background-color: blue; margin-top: 10px; } .test { width: 10ex; } .ref { width: 100px; } </style> <p>The test passes if there are two blue rectangles of equal length.</p> <!-- ExTest is a font whose OS/2 table's sxHeight field is set to an eighth of the font's units per em, so ex units should compute to 0.125em, resulting in the div being 100px wide. --> <div class="test" style="font: 80px ExTest;"></div> <div class="ref"></div>