="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Single Image WMS with Proj4js</textarea>
          <textarea class="hidden" name="description">Example of integrating Proj4js for coordinate transforms.</textarea>
          <textarea class="hidden" name="js">// Transparent Proj4js support:
//
// EPSG:21781 is known to Proj4js because its definition was loaded in the html.
// Now when we create an ol.proj.Projection instance wit