host-dom-001.html (807B)
1 <!doctype html> 2 <title>CSS Test: :host in DOM APIs</title> 3 <script src="/resources/testharness.js"></script> 4 <script src="/resources/testharnessreport.js"></script> 5 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> 6 <link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector"> 7 <div id="host"></div> 8 <script> 9 test(function() { 10 let root = host.attachShadow({ mode: "open" }); 11 root.innerHTML = `<div></div>`; 12 assert_false(host.matches(":host"), ":host shouldn't match from CSSOM from outside the shadow tree"); 13 assert_true(root.firstElementChild.matches(":host div"), ":host should match from within the shadow tree"); 14 assert_equals(root.querySelector(":host div"), root.firstElementChild, ":host should match from within the shadow tree"); 15 }) 16 </script>