Angular:

http://angularjs.org/

by mrajcok

HTML

<div ng-controller="MyCtrl">
  see console log
</div>

JavaScript

var myApp = angular.module('myApp',[]);

myApp.factory('myService', function($interpolate) {
    var template = "<h1>{{title}}</h1>";
    var interpolateFn = $interpolate(template);
    return {
        open: function(title) {
            var html = interpolateFn({ title: title });
            console.log(html);
            // append somewhere to DOM
        }
    }
});

function MyCtrl($scope, myService) {
    myService.open('The Title');
}