WordPress/wp-includes/js/customize-base.js

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h;i=i||{};if(!this.url()){return}h=JSON.stringify({id:j,data:i});this.targetWindow().postMessage(h,this.origin())},bind:function(j,i){var h=this.topics[j]||(this.topics[j]=d.Callbacks());h.add(i)},unbind:function(i,h){if(this.topics[i]){this.topics[i].remove(h)}}});b=d.extend(new b.Values(),b);a.customize=b})(wp,jQuery);