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                <base href="">
<script src="../webcomponentsjs/webcomponents-lite.js"></script>

<link rel="import" href="rsat-popup.html">
  function positionPopup(pos) {
    document.querySelector("rsat-popup").setAttribute("show", true);
    document.querySelector("rsat-popup").setAttribute("pos", pos);
  function hidePopup() {
    document.querySelector("rsat-popup").setAttribute("show", false);
  function backdropChanged(ele) {
    if (ele.checked) {
      document.querySelector("rsat-popup").setAttribute("backdrop", true);
    } else {
      document.querySelector("rsat-popup").setAttribute("backdrop", false);

<rsat-popup pos="center" backdrop="true" show="false">
  <div style="padding:10px;max-width:400px">
    <h3>Welcome !!!</h3>
    <h4>TLorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sagittis pellentesque lacus eleifend lacinia...</h4>
    <button onclick="hidePopup()">hide Popup</button>

<label>Popup with Backdrop ?</label>
<input type="checkbox" onchange="backdropChanged(this)" checked/> <br/><br/>
<label>Show Popup At </label>
<button onclick="positionPopup('center')">center</button>
<button onclick="positionPopup('top-left')">top left</button>
<button onclick="positionPopup('top-right')">top right</button>
<button onclick="positionPopup('bottom-left')">bottom left</button>
<button onclick="positionPopup('bottom-right')">bottom right</button>