first-line-and-placeholder-ref.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>
input::placeholder {
    color: red;
}
</style>
<form>
  <input placeholder="this text should be red">
</form>

chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/first-line-and-placeholder-ref.html