post-connection-steps-shadow-tree.html

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/post-connection-steps-shadow-tree.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>Post-connection steps in a shadow tree</title>

<link rel="help" href="https://dom.spec.whatwg.org/#concept-node-insert">

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

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

<body>

<script>

"use strict";

test(t => {

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

  const shadowRoot = host.attachShadow({ mode: "closed" });

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

  window.shadowTreeScriptExecutions = 0;

  t.add_cleanup(() => {

    delete window.shadowTreeScriptExecutions;

    host.remove();

});

  script.text = "window.shadowTreeScriptExecutions++";

  shadowRoot.append(script);

  assert_equals(window.shadowTreeScriptExecutions, 0, "script does not run while disconnected");

  document.body.append(host);

  assert_equals(window.shadowTreeScriptExecutions, 1, "script runs when its shadow-including tree becomes connected");

}, "Script post-connection steps run in a newly-connected shadow tree");

</script>