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chromium/third_party/blink/web_tests/external/wpt/html/semantics/selectors/pseudo-classes/placeholder-shown-type-change.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Selector: pseudo-class :placeholder-shown input type change</title>
<link rel="author" title="Rune Lillesveen" href="mailto:[email protected]">
<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;
  }
  :placeholder-shown + span {
    color: green;
  }
</style>
<input id="input" type="submit" placeholder="placeholder"></input>
<span id="sibling">This text should be green.</span>
<script>
  test(() => {
    assert_equals(getComputedStyle(sibling).color, "rgb(255, 0, 0)",
      "Not matching :placeholder-shown for type=submit");

    input.type = "text";
    assert_equals(getComputedStyle(sibling).color, "rgb(0, 128, 0)",
      "Matching :placeholder-shown for type=text");
  }, "Evaluation of :placeholder-shown changes for input type change.");
</script>