host-dom-001.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/host-dom-001.html - WPT Dashboard Interop Dashboard

<!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>