<html class="no-js">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script>
            document.getElementsByTagName("html")[0].className = "js";
        </script>
    </head>
    <body>
      <div class="wrapper">
		    <div class="iframe">
			    <iframe src="http://smashingmagazine.com" /></iframe>
		    </div>
		    <div class="iframe">
			    <iframe src="https://css-tricks.com/" /></iframe>
		    </div>
      </div>
    </body>
</html>
/* iframe */

.iframe {
  margin-bottom: 45px;
  border: 3px solid #131C28;
  overflow: hidden;
  background: #fff;
}

.iframe iframe {
  width: 100%;
  height: 400px;
  border: 0;
  display: block;
}

.iframe-header {
  display: none;
}

.js .iframe-header {
  display: block;
}

.iframe-content {
  /* ipad iframe hack */
  height: 400px;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.iframe-header a {
  font-size: 15px;
  color: white;
  background: #3B4658;
  display: block;
  padding: 15px;
  text-align: center;
  border-bottom: 3px solid #131C28;
}

.iframe-header a:hover,
.iframe-header a:focus {
  background: #6A798E;
}

.iframe-full-screen .iframe-header {
  display: block;
  position: absolute;
  height: 50px;
  width: 100%;
}

.iframe-full-screen .iframe-content {
  position: absolute;
  top: 50px;
  bottom: 0;
  width: 100%;
  height: auto;
}

.iframe-full-screen .iframe-header a {
  padding: 0;
  height: 44px;
  line-height: 44px;
  text-align: center;
  border: 3px solid #131C28;
}

.iframe-full-screen body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.iframe-full-screen .iframe.iframe-active{
  width: 100%;
  height: 100%;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 9999;
  border: none;
}

.iframe-full-screen .iframe iframe {
  position: absolute;
  height: 100%;
  width: 100%;
  border: none;
}

.wrapper {
  max-width: 1000px;
  margin: 20px auto;
  padding: 0 20px;
}

@media all and (max-height: 400px){
  .iframe {
    height: 300px;
  }
}
$(document).ready(function(){

    $('.iframe').responsiveIframes({ openMessage: "Full screen", closeMessage: "Close full screen" });

});

/**
 * jQuery Responsive IFrames
 * @author Armin Solecki
 * @source https://github.com/arminsolecki/responsive-iframes/
 * Licensed under the MIT License (http://creativecommons.org/licenses/MIT/)
 *
 **/
(function($){
    $.responsiveIframes = function(el, options){
        var self = this;
        
        // Access to jQuery and DOM versions of element
        self.$el = $(el);
        self.el = el;
        
        // Add a reverse reference to the DOM object
        self.$el.data("responsiveIframes", self);
        
        self.init = function () {
            self.options = $.extend({}, $.responsiveIframes.defaultOptions, options);

            // wrap iframe
            var iframeSrc = self.$el.find('iframe').wrap('<div class="iframe-content" />').attr('src');

            //generate header
            var header = '<div class="iframe-header">' +
                              '<a href="'+ iframeSrc +'" class="iframe-trigger">'+ self.options.openMessage +'</a>' +
                          '</div>';

            var trigger = self.$el.prepend(header).find('.iframe-trigger');

            // click event
            $(trigger).click(function (e) {
                e.preventDefault();

                var $this = $(this),
                    $html = $('html'),
                    isFullScreen = $html.hasClass("iframe-full-screen"),
                    message = isFullScreen ? self.options.openMessage : self.options.closeMessage;

                $this.text(message);

                if (isFullScreen) {
					self.$el.removeClass("iframe-active");
                    $html.removeClass("iframe-full-screen");
                    setTimeout(function () {
                        $(window).scrollTop($this.data('iframe-scroll-position'));
                    }, 1);
                } else {
                    $this.data('iframe-scroll-position', $(window).scrollTop());
					self.$el.addClass("iframe-active");
                    $html.addClass("iframe-full-screen");
                }

            });
        };
                
        // Run initializer
        self.init();
    };
    
    $.responsiveIframes.defaultOptions = {
        openMessage: "Full screen",
        closeMessage: "Close"
    };
    
    $.fn.responsiveIframes = function(options){
        return this.each(function(){
            (new $.responsiveIframes(this, options));
        });
    };
    
})(jQuery);
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External CSS

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External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js