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              <a id="open-popup" href="#my-popup">Open popup</a>

<div id="my-popup" class="mfp-hide white-popup">
  Inline popup, try to close me


              #open-popup {padding:20px}
.white-popup {
  position: relative;
  background: #FFF;
  padding: 40px;
  width: auto;
  max-width: 200px;
  margin: 20px auto;
  text-align: center;



  callbacks: {
    open: function() {
     // this part overrides "close" method in MagnificPopup object
      $.magnificPopup.instance.close = function () {
          if (!confirm("Are you sure?")) {
           // "proto" variable holds MagnificPopup class prototype
           // The above change that we did to instance is not applied to the prototype, 
           // which allows us to call parent method:
      // you may override any method like so, just note that it's applied globally


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