<!doctype html> <meta charset="utf-8"> <title>:host and nesting (bare declarations)</title> <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> <link rel="author" title="Mozilla" href="https://mozilla.org"> <link rel="help" href="https://drafts.csswg.org/css-nesting/#nest-selector"> <link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html"> <p>Test passes if there is a filled green square.</p> <div id="host"></div> <script> host.attachShadow({mode: "open"}).innerHTML = ` <style> :host { @media (width >= 0) { width: 100px; height: 100px; background-color: green; } } </style> `; </script>