Node-isConnected-shadow-dom.html

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/Node-isConnected-shadow-dom.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Test of Node.isConnected in a shadow tree</title>

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

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

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

<body>

<script>

"use strict";

function testIsConnected(mode) {

  test(() => {

    const host = document.createElement("div");

    document.body.appendChild(host);

    const root = host.attachShadow({ mode });

    const node = document.createElement("div");

    root.appendChild(node);

    assert_true(node.isConnected);

  }, `Node.isConnected in a ${mode} shadow tree`);

for (const mode of ["closed", "open"]) {

  testIsConnected(mode);

</script>