Node-appendChild-script-in-script.tentative.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /dom/nodes/insertion-removing-steps/Node-appendChild-script-in-script.tentative.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>Node.appendChild: inserting a script and some code in an empty script</title>

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

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

<body>

<script id="s1"></script>

<script>

const happened = [];

test(() => {

  const s1 = document.getElementById("s1");

  const s2 = document.createElement("script");

  // This script, which is ultimately a *child* of the

  // already-connected-but-empty `s1` script, runs second, after `s1` runs. See

  // the example in

  // http://html.spec.whatwg.org/C/#script-processing-model:children-changed-steps

  // for more information.

//

  // HISTORICAL CONTEXT: There used to be a condition in the HTML standard that

  // said an "outer" script must be "prepared" when a node gets inserted into

  // the script. BUT it also stipulated that if the insertion consists of any

  // "inner" (nested, essentially) script elements, then this "outer" script

  // must prepare/execute after any of those "inner" newly-inserted scripts

  // themselves get prepared.

//

  // This changed in https://github.com/whatwg/html/pull/10188.

  s2.textContent = `

    happened.push("s2");

    // This text never executes in the outer script, because by the time this

    // gets appended, the outer script has "already started" [1], so it does not

    // get re-prepared/executed a second time.

//

    // [1]: https://html.spec.whatwg.org/C#already-started

    s1.appendChild(new Text("happened.push('s1ran');"));

    happened.push("s2ran");

`;

  const df = document.createDocumentFragment();

  df.appendChild(new Text(`happened.push("s1");`));

  df.appendChild(s2);

  assert_array_equals(happened, []);

  s1.appendChild(df);

  assert_array_equals(happened, ["s1", "s2", "s2ran"]);

}, "An outer script whose preparation/execution gets triggered by the " +

   "insertion of a 'nested'/'inner' script, executes *before* the inner " +

   "script executes");

</script>