old_contents: (function(ns) {
  
      var namespaces = [this];
  
      var attachBehavior = function($element, behavior) {
          var fn = namespaces;
  
          behavior.replace(/([^.]+)/g, function(object) {
              if(fn === namespaces) {
                  for(var nextFn, index = 0; index < fn.length; ++index) {
                      nextFn = fn[index][object];
                      if(nextFn) {
                          fn = nextFn;
                          break;
                      }
                  }
              } else if(typeof fn === 'object') {
                  fn = fn[object];
              }
          });
  
          if(typeof fn === 'function') {
              return fn($element);
          } else {
              if (window.console && console.warn) {
                  console.warn("elementalJS: Unable to find behavior:", behavior);
              }
          }
      };
  
      ns.load = function(container) {
          var $selector;
          if (container === document) {
              $selector = $('[data-behavior]');
          }
          else {
              $selector = $(container).find("*").andSelf().filter("[data-behavior]");
          }
  
          $selector.each(function(index, element) {
              var $element = $(element);
              var behaviors = $element.data('behavior');
              behaviors.replace(/([^ ]+)/g, function(behavior) {
                  attachBehavior($element, behavior);
              });
          });
      };
  
      ns.addNamespace = function(namespace) {
          namespaces.push(namespace);
      };
  
  })(window.Elemental = {});
  
new_contents: (function(ns) {
  
      var namespaces = [this];
  
      var attachBehavior = function($element, behavior) {
          var fn = namespaces;
  
          behavior.replace(/([^.]+)/g, function(object) {
              if(fn === namespaces) {
                  for(var nextFn, index = 0; index < fn.length; ++index) {
                      nextFn = fn[index][object];
                      if(nextFn) {
                          fn = nextFn;
                          break;
                      }
                  }
              } else if(typeof fn === 'object') {
                  fn = fn[object];
              }
          });
  
          if(typeof fn === 'function') {
              return fn($element);
          } else {
              if (window.console && console.warn) {
                  console.warn("elementalJS: Unable to find behavior:", behavior);
              }
          }
      };
  
      ns.load = function(container) {
          var $selector;
          $selector = $('[data-behavior]', container)
  
          if ($(container).data('behavior')) {
              $selector = $selector.add(container);
          }
  
          $selector.each(function(index, element) {
              var $element = $(element);
              var behaviors = $element.data('behavior');
              behaviors.replace(/([^ ]+)/g, function(behavior) {
                  attachBehavior($element, behavior);
              });
          });
      };
  
      ns.addNamespace = function(namespace) {
          namespaces.push(namespace);
      };
  
  })(window.Elemental = {});
  
subject: Improve perfomance on large DOMs when container is not whole document.