File: Node-isConnected-shadow-dom.html

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<!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>