def mount context
      handler_name = @handler_name
      proc {
        Context.wipe handler_name
        Context.render context, handler_name
      }
    end
def mount context
      handler_name = @handler_name
      proc {
        Context.wipe handler_name
        Context.render context, handler_name
      }
    end
@see #Handlers#define_for
 wipe the matching element and render a context

 @param [Symbol] context context to be mounted to matching element of handler