<!doctype html> <meta charset="utf-8"> <link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-lengths"> <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1832481"> <link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez"> <link rel="author" href="https://mozilla.org" title="Mozilla"> <link rel="match" href="container-units-rule-cache-ref.html"> <style> .container { width: 100px; container-type: size; } .half { height: 50cqh; background-color: green; } </style> <div class="container" style="height: 100px"> <div class="half"></div> </div> <div class="container" style="height: 200px"> <div class="half"></div> </div>