"use strict";
  const { mixin } = require("../../utils");
  const { domSymbolTree } = require("../helpers/internal-constants");
  const NODE_TYPE = require("../node-type");
  const NodeImpl = require("./Node-impl").implementation;
  const NonElementParentNodeImpl = require("./NonElementParentNode-impl").implementation;
  const ParentNodeImpl = require("./ParentNode-impl").implementation;
  const idlUtils = require("../generated/utils");
  
  class DocumentFragmentImpl extends NodeImpl {
    constructor(globalObject, args, privateData) {
      super(globalObject, args, {
        ownerDocument: idlUtils.implForWrapper(globalObject._document),
        ...privateData
      });
  
      const { host } = privateData;
      this._host = host;
  
      this.nodeType = NODE_TYPE.DOCUMENT_FRAGMENT_NODE;
    }
  
    // This is implemented separately for Document (which has a _ids cache) and DocumentFragment (which does not).
    getElementById(id) {
      if (id === "") {
        return null;
      }
  
      for (const descendant of domSymbolTree.treeIterator(this)) {
        if (descendant.nodeType === NODE_TYPE.ELEMENT_NODE && descendant.getAttributeNS(null, "id") === id) {
          return descendant;
        }
      }
  
      return null;
    }
  }
  
  mixin(DocumentFragmentImpl.prototype, NonElementParentNodeImpl.prototype);
  mixin(DocumentFragmentImpl.prototype, ParentNodeImpl.prototype);
  
  module.exports = {
    implementation: DocumentFragmentImpl
  };