| <!doctype html> |
| <title>CSS Test: :host in DOM APIs</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector"> |
| <div id="host"></div> |
| <script> |
| test(function() { |
| let root = host.attachShadow({ mode: "open" }); |
| root.innerHTML = `<div></div>`; |
| assert_false(host.matches(":host"), ":host shouldn't match from CSSOM from outside the shadow tree"); |
| assert_true(root.firstElementChild.matches(":host div"), ":host should match from within the shadow tree"); |
| assert_equals(root.querySelector(":host div"), root.firstElementChild, ":host should match from within the shadow tree"); |
| }) |
| </script> |
