text: <!DOCTYPE html>
  <meta charset="utf-8">
  <title>Selector: pseudo-classes (:read-write, :read-only) input type change</title>
  <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
  <link rel="help" href="https://html.spec.whatwg.org/multipage/#pseudo-classes">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <style>
    span {
      color: red;
      background-color: pink;
    }
    :required + span {
      color: green;
    }
    :not(:optional) + span {
      background-color: lime;
    }
  </style>
  <input id="hiddenInput" type="hidden" required>
  <span id="sibling">This text should be green on lime background.</span>
  <script>
    test(() => {
      assert_equals(getComputedStyle(sibling).color, "rgb(255, 0, 0)",
        "Not matching :required for type=hidden");
      assert_equals(getComputedStyle(sibling).backgroundColor, "rgb(255, 192, 203)",
        "Matching :optional for type=hidden");
  
      hiddenInput.type = "text";
  
      assert_equals(getComputedStyle(sibling).color, "rgb(0, 128, 0)",
        "Matching :required for type=text");
      assert_equals(getComputedStyle(sibling).backgroundColor, "rgb(0, 255, 0)",
        "Matching :not(:optional) for type=text");
    }, "Evaluation of :required and :optional changes for input type change.");
  </script>
  