<h5>Div-1</h5>
<div id='div-1' style="min-height:250px;">
  <script type='text/javascript'>
    googletag.cmd.push(function() {
      googletag.display('div-1');
    });
  </script>
</div>
   
  
    var sizes = [
  [300, 250]
];
var PREBID_TIMEOUT = 700;
var adUnits = [{
  code: '/19968336/header-bid-tag-1',
  mediaTypes: {
    banner: {
      sizes: sizes
    }
  },
  bids: [{
    bidder: 'appnexus',
    params: {
      placementId: 13144370
    }
  }]
}];
// ======== DO NOT EDIT BELOW THIS LINE =========== //
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
googletag.cmd.push(function() {
  googletag.pubads().disableInitialLoad();
});
var pbjs = pbjs || {};
pbjs.que = pbjs.que || [];
pbjs.que.push(function() {
  pbjs.addAdUnits(adUnits);
  pbjs.requestBids({
    bidsBackHandler: initAdserver
  });
});
function initAdserver() {
  if (pbjs.initAdserverSet) return;
  pbjs.initAdserverSet = true;
  googletag.cmd.push(function() {
    pbjs.setTargetingForGPTAsync && pbjs.setTargetingForGPTAsync();
    googletag.pubads().refresh();
  });
}
setTimeout(function() {
  initAdserver();
}, PREBID_TIMEOUT);
googletag.cmd.push(function() {
  googletag.defineSlot('/19968336/header-bid-tag-1', sizes, 'div-1')
    .addService(googletag.pubads());
  googletag.pubads().enableSingleRequest();
  googletag.enableServices();
});
   
  
    <html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Basic Example</title>
    <!-- required scripts -->
    <script async src="https://cdn.jsdelivr.net/npm/prebid.js@latest/dist/not-for-prod/prebid.js"></script>
    <script async src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"></script>
    
  </head>
  <body>
  
  <!-- javascript -->
  <script>var sizes = [
  [300, 250]
];
var PREBID_TIMEOUT = 700;
var adUnits = [{
  code: '/19968336/header-bid-tag-1',
  mediaTypes: {
    banner: {
      sizes: sizes
    }
  },
  bids: [{
    bidder: 'appnexus',
    params: {
      placementId: 13144370
    }
  }]
}];
// ======== DO NOT EDIT BELOW THIS LINE =========== //
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
googletag.cmd.push(function() {
  googletag.pubads().disableInitialLoad();
});
var pbjs = pbjs || {};
pbjs.que = pbjs.que || [];
pbjs.que.push(function() {
  pbjs.addAdUnits(adUnits);
  pbjs.requestBids({
    bidsBackHandler: initAdserver
  });
});
function initAdserver() {
  if (pbjs.initAdserverSet) return;
  pbjs.initAdserverSet = true;
  googletag.cmd.push(function() {
    pbjs.setTargetingForGPTAsync && pbjs.setTargetingForGPTAsync();
    googletag.pubads().refresh();
  });
}
setTimeout(function() {
  initAdserver();
}, PREBID_TIMEOUT);
googletag.cmd.push(function() {
  googletag.defineSlot('/19968336/header-bid-tag-1', sizes, 'div-1')
    .addService(googletag.pubads());
  googletag.pubads().enableSingleRequest();
  googletag.enableServices();
});
</script>
  <!-- html -->
  <h5>Div-1</h5>
<div id='div-1' style="min-height:250px;">
  <script type='text/javascript'>
    googletag.cmd.push(function() {
      googletag.display('div-1');
    });
  </script>
</div>
  </body>
</html>