W3 schools un copywrited code

//////


<!DOCTYPE html>
<html lang="en-US">
<head>
<title>Tryit Editor v2.6</title>



var node = document.getElementsByTagName('script')[0];

alert(node.src);
})();
</script>
<script type='text/javascript'>
 // GPT slots
 var gptAdSlots = [];
 googletag.cmd.push(function() {

   var leaderMapping = googletag.sizeMapping().
   // Mobile ad
   addSize([0, 0], [320, 50]).
   // Vertical Tablet ad
   addSize([468, 0], [468, 60]).
   // Horizontal Tablet
   addSize([728, 0], [728, 90]).
   // Desktop and bigger ad
// addSize([970, 0], [[728, 90], [970, 90]]).build();
   addSize([970, 0], [728, 90]).build();
// gptAdSlots[0] = googletag.defineSlot('/16833175/TryitLeaderboard', [[728, 90], [970, 90]], 'div-gpt-ad-1428407818244-0').
   gptAdSlots[0] = googletag.defineSlot('/16833175/TryitLeaderboard', [728, 90], 'div-gpt-ad-1428407818244-0').
   defineSizeMapping(leaderMapping).addService(googletag.pubads());


   googletag.pubads().setTargeting("content","tryhtml");
   googletag.enableServices();
 });
</script>
<script>
if (window.addEventListener) {
    window.addEventListener("resize", browserResize);
} else if (window.attachEvent) {
    window.attachEvent("onresize", browserResize);
}
var xbeforeResize = window.innerWidth;

function browserResize() {
    var afterResize = window.innerWidth;
    if ((xbeforeResize < (970) && afterResize >= (970)) || (xbeforeResize >= (970) && afterResize < (970)) ||
        (xbeforeResize < (728) && afterResize >= (728)) || (xbeforeResize >= (728) && afterResize < (728)) ||
        (xbeforeResize < (468) && afterResize >= (468)) ||(xbeforeResize >= (468) && afterResize < (468))) {
        xbeforeResize = afterResize;
        googletag.cmd.push(function() {
            googletag.pubads().refresh([gptAdSlots[0]]);
        });
    }
}
</script>
<script type="text/javascript">
function submitTryit() {
  var text = document.getElementById("textareaCode").value;
  var ifr = document.createElement("iframe");
  ifr.setAttribute("frameborder", "0");
  ifr.setAttribute("id", "iframeResult");
  document.getElementById("iframewrapper").innerHTML = "";
  document.getElementById("iframewrapper").appendChild(ifr);
  var ifrw = (ifr.contentWindow) ? ifr.contentWindow : (ifr.contentDocument.document) ? ifr.contentDocument.document : ifr.contentDocument;
  ifrw.document.open();
  ifrw.document.write(text);
  ifrw.document.close();
}
</script>
<style>

</style>
</head>
<body>
<div id='tryitLeaderboard'>
<!-- TryitLeaderboard -->
<div id='div-gpt-ad-1428407818244-0'>
<script type='text/javascript'>googletag.cmd.push(function() { googletag.display('div-gpt-ad-1428407818244-0'); });</script>
</div>
</div>

<div class="container">
  <div class="textareacontainer">
    <div class="textarea">
      <div style="overflow:auto;">
        <div class="headerText">Edit This Code:</div>
        <button class="seeResult" type="button" onclick="submitTryit()">See Result &raquo;</button>
      </div>
      <div class="textareawrapper">
        <textarea autocomplete="off" class="code_input" id="textareaCode" wrap="logical" spellcheck="false"><!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>

<h1>This is a Heading</h1>
<p>This is a paragraph.</p>

</body>
</html>
</textarea>
          <form autocomplete="off" style="margin:0px;display:none;">
            <input type="hidden" name="code" id="code" />
            <input type="hidden" id="bt" name="bt" />
          </form>
       </div>
    </div>
  </div>
  <div class="iframecontainer">
    <div class="iframe">
      <div style="overflow:auto;">
        <div class="headerText">Result:</div>
      </div>
      <div id="iframewrapper" class="iframewrapper">

      </div>
    </div>
  </div>
  <div class="footerText">Try it Yourself - &copy; <a href="http://www.w3schools.com">w3schools.com</a></div>
</div>
<script>submitTryit()</script>
</body>
</html>
//////
<script type="text/javascript">
function submitTryit() {
  var text = document.getElementById("textareaCode").value;
  var ifr = document.createElement("iframe");
  ifr.setAttribute("frameborder", "0");
  ifr.setAttribute("id", "iframeResult");
  document.getElementById("iframewrapper").innerHTML = "";
  document.getElementById("iframewrapper").appendChild(ifr);
  var ifrw = (ifr.contentWindow) ? ifr.contentWindow : (ifr.contentDocument.document) ? ifr.contentDocument.document : ifr.contentDocument;
  ifrw.document.open();
  ifrw.document.write(text);
  ifrw.document.close();
}
</script>
<style>

</style>
</head>
<body>
<div id="tryitLeaderboard">
<!-- TryitLeaderboard -->
<div id="div-gpt-ad-1428407818244-0">
<script type="text/javascript">googletag.cmd.push(function() { googletag.display('div-gpt-ad-1428407818244-0'); });</script>
</div>
</div>

<div class="container">
  <div class="textareacontainer">
    <div class="textarea">
      <div style="overflow:auto;">
        <div class="headerText">Edit This Code:</div>
        <button class="seeResult" type="button" onclick="submitTryit()">See Result »</button>
      </div>
      <div class="textareawrapper">
        <textarea autocomplete="off" class="code_input" id="textareaCode" wrap="logical" spellcheck="false"></textarea>
          <form autocomplete="off" style="margin:0px;display:none;">
            <input type="hidden" name="code" id="code">
            <input type="hidden" id="bt" name="bt">
          </form>
       </div>
    </div>
  </div>
  <div class="iframecontainer">
    <div class="iframe">
      <div style="overflow:auto;">
        <div class="headerText">Result:</div>
      </div>
      <div id="iframewrapper" class="iframewrapper">

      </div>
    </div>
  </div>
  <div class="footerText">Try it Yourself - © <a href="http://www.w3schools.com">w3schools.com</a></div>
</div>
<script>submitTryit()</script>


</body></html>

/////
<script type="text/javascript">
function submitTryit() {
  var text = document.getElementById("textareaCode").value;
  var ifr = document.createElement("iframe");
  ifr.setAttribute("frameborder", "0");
  ifr.setAttribute("id", "iframeResult");
  document.getElementById("iframewrapper").innerHTML = "";
  document.getElementById("iframewrapper").appendChild(ifr);
  var ifrw = (ifr.contentWindow) ? ifr.contentWindow : (ifr.contentDocument.document) ? ifr.contentDocument.document : ifr.contentDocument;
  ifrw.document.open();
  ifrw.document.write(text);
  ifrw.document.close();
}
</script>
<style>

</style>
</head>
<body>
<div id="tryitLeaderboard">
<!-- TryitLeaderboard -->
<div id="div-gpt-ad-1428407818244-0">
<script type="text/javascript">googletag.cmd.push(function() { googletag.display('div-gpt-ad-1428407818244-0'); });</script>
</div>
</div>

<div class="container">
  <div class="textareacontainer">
    <div class="textarea">
      <div style="overflow:none;">
        <div class="headerText">Edit This Code:</div>
        <button class="seeResult" type="button" onclick="submitTryit()">See Result »</button>
      </div>
      <div class="textareawrapper">
        <textarea autocomplete="off" class="code_input" id="textareaCode" spellcheck="false"></textarea>
          <form autocomplete="on" style="margin:0px;display:none;">
            <input type="text" name="code" id="code">
            <input type="hidden" id="bt" name="bt">
          </form>
       </div>
    </div>
  </div>
  <div class="iframecontainer">
    <div class="iframe">
      <div style="overflow:auto;">
        <div class="headerText">Result:</div>
      </div>
      <div id="iframewrapper" class="iframewrapper">

      </div>
    </div>
  </div>
  <div class="footerText">Try it Yourself - © <a href="http://www.w3schools.com">w3schools.com</a></div>
</div>
<script>submitTryit()</script>


</body></html>