https://www.eurostarshotels.com/js/libraries/iframe/jquery.iframeResizer.min.js

1/*! iFrame Resizer (jquery.iframeSizer.min.js ) - v0.1.0 - 2013-08-21
2 *  Desc: Force cross domain iframes to size to content.
3 *  Requires: iframeSizer.contentWindow.min.js to be loaded into the target frame.
4 *  Copyright: (c) 2013 David J. Bradshaw - [email protected]
5 *  License: MIT and GPL
6 */
7
8(function(e){function o(e){i.log&&window.console&&console.log(t+" "+e)}var t="[iFrameSizer]",n=t.length,r=0,i,s={log:!1,contentWindowBodyMargin:8,doHeight:!0,doWidth:!1,interval:0,callback:function(){}};e(window).on("message",function(e){function r(e){function r(){function e(e){u.iframe.style[e]=u[e]+"px",o(u.iframe.id+" "+e+" set to "+u[e]+"px")}i.doHeight&&e("height"),i.doWidth&&e("width")}function s(){var t=e.substr(n).split(":");u={iframe:document.getElementById(t[0]),height:t[1],width:t[2]}}var u={};t===e.substr(0,n)&&(s(),r(),i.callback(u))}r(e.originalEvent.data)}),e.fn.iFrameSizer=function(n){return i=e.extend({},s,n),this.each(function(){function n(){return a.contentWindow?!0:!1}function s(){a.style.overflow="hidden",a.scrolling="no",e(a).on("load",function(){u(a)}),u(a)}function u(){function e(){""===a.id&&(a.id="iFrameSizer"+r++,o("Added missing iframe ID: "+a.id))}function n(){var e=a.id+":"+i.contentWindowBodyMargin+":"+i.doWidth+":"+i.log+":"+i.interval;o("Sending init msg to iframe ("+e+")"),a.contentWindow.postMessage(t+e,"*")}e(),n()}var a=this;n()&&s()})}})(window.jQuery);