slotted-matches.html

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

<!doctype html>

<title>CSS Test: ::slotted() should not match via the matches() API, since it's in the wrong scope</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/#slotted-pseudo">

<link rel="help" href="https://dom.spec.whatwg.org/#dom-element-matches">

<link rel="help" href="https://bugzil.la/1544242">

<div id="host"><div id="slotted"></div></div>

<script>

test(function() {

  let slotted = document.getElementById("slotted");

  host.attachShadow({ mode: "open" }).innerHTML = `<slot></slot>`;

  assert_false(slotted.matches("::slotted(div)"), "Shouldn't match ::slotted from the outer tree")

}, "::slotted() doesn't reveal the presence of shadow DOM via matches()");

</script>