Here you can find the source of isHTMLElement(Element elem)
public static boolean isHTMLElement(Element elem)
//package com.java2s; /*//from w w w. j a v a 2s . co m ItsNat Java Web Application Framework Copyright (C) 2007-2011 Jose Maria Arranz Santamaria, Spanish citizen This software is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ import org.w3c.dom.Element; import org.w3c.dom.html.HTMLElement; public class Main { public static boolean isHTMLElement(Element elem) { return elem instanceof HTMLElement; } }