wpt/css/selectors/invalidation/placeholder-shown.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>CSS Selectors Test: :placeholder-shown invalidation</title>
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors/#placeholder">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #target { color: red; }
  input:placeholder-shown + #target { color: green; }
</style>
<input id="input" type="text">
<span id="target"></span>
<script>
  const red = "rgb(255, 0, 0)";
  const green = "rgb(0, 128, 0)";

  test(() => {
    assert_equals(getComputedStyle(target).color, red);
  }, "Initially no placeholder text");

  test(() => {
    input.setAttribute("placeholder", "PLACEHOLDER");
    assert_equals(getComputedStyle(target).color, green);
  }, "Added placeholder text");

  test(() => {
    input.setAttribute("placeholder", "");
    assert_equals(getComputedStyle(target).color, green);
  }, "Set placeholder text to empty string");

  test(() => {
    input.removeAttribute("placeholder");
    assert_equals(getComputedStyle(target).color, red);
  }, "Removed placeholder attribute");
</script>