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 | | // This object will be used as the prototype for Nodes when creating a |  | // DOM-Level-1-compliant structure. |  | var NodePrototype = module.exports = { |  |     get firstChild() { |  |         var children = this.children; |  |         return children && children[0] || null; |  |     }, |  |     get lastChild() { |  |         var children = this.children; |  |         return children && children[children.length - 1] || null; |  |     }, |  |     get nodeType() { |  |         return nodeTypes[this.type] || nodeTypes.element; |  |     } |  | }; |  |   |  | var domLvl1 = { |  |     tagName: "name", |  |     childNodes: "children", |  |     parentNode: "parent", |  |     previousSibling: "prev", |  |     nextSibling: "next", |  |     nodeValue: "data" |  | }; |  |   |  | var nodeTypes = { |  |     element: 1, |  |     text: 3, |  |     cdata: 4, |  |     comment: 8 |  | }; |  |   |  | Object.keys(domLvl1).forEach(function(key) { |  |     var shorthand = domLvl1[key]; |  |     Object.defineProperty(NodePrototype, key, { |  |         get: function() { |  |             return this[shorthand] || null; |  |         }, |  |         set: function(val) { |  |             this[shorthand] = val; |  |             return val; |  |         } |  |     }); |  | }); | 
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