insertion-removing-steps-script.window.js

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/insertion-removing-steps/insertion-removing-steps-script.window.html - WPT Dashboard Interop Dashboard

promise_test(async t => {

  const fragmentWithTwoScripts = new DocumentFragment();

  const script0 = document.createElement('script');

  const script1 = fragmentWithTwoScripts.appendChild(document.createElement('script'));

  const script2 = fragmentWithTwoScripts.appendChild(document.createElement('script'));

  window.kBaselineNumberOfScripts = document.scripts.length;

  assert_equals(document.scripts.length, kBaselineNumberOfScripts,

      "The WPT infra starts out with exactly 3 scripts");

  window.script0Executed = false;

  script0.innerText = `

    script0Executed = true;

    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 1,

        'script0 can observe itself and no other scripts');

`;

  window.script1Executed = false;

  script1.innerText = `

    script1Executed = true;

    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 2,

        "script1 executes synchronously, and thus observes only itself and " +

        "previous scripts");

`;

  window.script2Executed = false;

  script2.innerText = `

    script2Executed = true;

    assert_equals(document.scripts.length, kBaselineNumberOfScripts + 3,

        "script2 executes synchronously, and thus observes itself and all " +

        "previous scripts");

`;

  assert_false(script0Executed, "Script0 does not execute before append()");

  document.body.append(script0);

  assert_true(script0Executed,

      "Script0 executes synchronously during append()");

  assert_false(script1Executed, "Script1 does not execute before append()");

  assert_false(script2Executed, "Script2 does not execute before append()");

  document.body.append(fragmentWithTwoScripts);

  assert_true(script1Executed,

      "Script1 executes synchronously during fragment append()");

  assert_true(script2Executed,

      "Script2 executes synchronously during fragment append()");

}, "Script node insertion is not atomic with regard to execution. Each " +

   "script is synchronously executed during the HTML element insertion " +

   "steps hook");