chromium/src/third_party/blink/web_tests/fast/css-generated-content/shadow-host-context-pseudo-class.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <body class=shadow>
 <div id="host">HOST</div>
 </body>
 <script>
 var host = document.getElementById('host');
 var root = host.attachShadow({mode: 'open'});
 root.innerHTML = '\
 <style>\
   :host-context(body.shadow)::before { content: "before shadow root:"; }\
   :host-context(body.light)::before { content: "this should not appear:"; }\
 </style>\
 <span>SHADOW</span>';
 </script>
	<!DOCTYPE html>
	<body class=shadow>
	<div id="host">HOST</div>
	</body>
	<script>
	var host = document.getElementById('host');
	var root = host.attachShadow({mode: 'open'});
	root.innerHTML = '\
	<style>\
	:host-context(body.shadow)::before { content: "before shadow root:"; }\
	:host-context(body.light)::before { content: "this should not appear:"; }\
	</style>\
	<span>SHADOW</span>';
	</script>