How is DOM and Virtual DOM represented in memory?

var listObj = {
   "properties" : {
      "background-color" : "#ccc"
   },
   "children" : [
      {
         "properties" : { "value" : "item-a", "font-size" : "12px", "color" : "red", "h-align" : "left" }
      },
      {
         "properties" : { "value" : "item-b", "font-size" : "12px", "color" : "red", "h-align" : "left" }
      },
      {
         "properties" : { "value" : "item-c", "font-size" : "12px", "color" : "red", "h-align" : "left" }
      }
   ],
   removeItem : function( item ){ /* Logic to remove an item and render the udpated list */ },
   addItem : function( item ){ /* Logic to add an item and render the udpated list */ },
   renderList : function(){ /* Logic to render the udpated list */ }
};

var genericFormObj = {
  "name" : "",
  "action" : "",
  "form-attributes" : [
      {
         "order-of-display" : 1, "type" : "label", "value" : "" , "id" : ""
      },
      {
         "order-of-display" : 2, "type" : "textbox", "value" : ""  , "id" : ""
      }
   ]
}