selectedcontent-parser-script-runs-once.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-select-element/customizable-select/selectedcontent-parser-script-runs-once.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Parser-inserted scripts in a selected option run once</title>

<link rel=help href="https://html.spec.whatwg.org/#the-option-element:stack-of-open-elements">

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

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

<script>

  window.runs = 0;

</script>

<select>

  <button><selectedcontent></selectedcontent></button>

  <option>one</option>

  <option selected>

    <script>runs++</script>

    <span>two</span>

  </option>

</select>

<script>

  test(() => {

    assert_equals(runs, 1, "Script should run exactly once");

    const selectedcontent = document.querySelector("selectedcontent");

    assert_equals(selectedcontent.querySelectorAll("script").length, 1,

                  "selectedcontent should contain the cloned script");

    assert_equals(selectedcontent.querySelector("span")?.textContent, "two",

                  "selectedcontent should contain the whole option");

  }, "A parser-inserted script in a selected option isn't cloned into selectedcontent before it runs");

</script>