ParentNode-querySelector-host-pseudo-class.html

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/ParentNode-querySelector-host-pseudo-class.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Using :host pseudo-class selector in shadow DOM</title>

<meta charset="utf-8">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<!-- Regression test for https://github.com/jsdom/jsdom/issues/3618 -->

<section id="test-container"></section>

<script>

"use strict";

test(() => {

  const section = document.getElementById("test-container");

  const article = document.createElement("article");

  // Attach a shadow root to the section

  const shadowSection = section.attachShadow({ mode: "open" });

  // Add the article to the shadow root

  shadowSection.appendChild(article);

  // This should work - selecting an article element directly

  const normalQuery = shadowSection.querySelector("article");

  assert_equals(normalQuery, article, "Simple querySelector for article should find the element");

  // This should also work - using :host to refer to the host element

  const hostQuery = shadowSection.querySelector(":host > article");

  assert_equals(hostQuery, article, "querySelector with :host pseudo-class should find the element");

});

</script>