<!DOCTYPE html>
<html>
  <link rel='stylesheet' type='text/css' href='style.css'>
  <style>
    textarea::-moz-placeholder,
    textarea::placeholder {
      display: inline;
    }
  </style>
  <body>
    <textarea placeholder='foo'></textarea>
    <textarea placeholder='bar'></textarea>
  </body>
</html>