"use strict";
  const HTMLCollection = require("../generated/HTMLCollection");
  const HTMLElementImpl = require("./HTMLElement-impl").implementation;
  const DefaultConstraintValidationImpl =
    require("../constraint-validation/DefaultConstraintValidation-impl").implementation;
  const { formOwner } = require("../helpers/form-controls");
  const { mixin } = require("../../utils");
  const { descendantsByLocalNames } = require("../helpers/traversal");
  
  const listedElements = new Set(["button", "fieldset", "input", "object", "output", "select", "textarea"]);
  
  class HTMLFieldSetElementImpl extends HTMLElementImpl {
    constructor(globalObject, args, privateData) {
      super(globalObject, args, privateData);
  
      this._customValidityErrorMessage = "";
    }
  
    get elements() {
      return HTMLCollection.createImpl(this._globalObject, [], {
        element: this,
        query: () => descendantsByLocalNames(this, listedElements)
      });
    }
  
    get form() {
      return formOwner(this);
    }
  
    get type() {
      return "fieldset";
    }
  
    _barredFromConstraintValidationSpecialization() {
      return true;
    }
  }
  
  mixin(HTMLFieldSetElementImpl.prototype, DefaultConstraintValidationImpl.prototype);
  
  module.exports = {
    implementation: HTMLFieldSetElementImpl
  };