/*
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program 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 W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.css;

import org.w3c.dom.stylesheets.DocumentStyle;
import org.w3c.dom.Element;

/**
 * This interface represents a document with a CSS view.
 * <p> The <code>getOverrideStyle</code> method provides a mechanism through 
 * which a DOM author could effect immediate change to the style of an 
 * element without modifying the explicitly linked style sheets of a 
 * document or the inline style of elements in the style sheets. This style 
 * sheet comes after the author style sheet in the cascade algorithm and is 
 * called override style sheet. The override style sheet takes precedence 
 * over author style sheets. An "!important" declaration still takes 
 * precedence over a normal declaration. Override, author, and user style 
 * sheets all may contain "!important" declarations. User "!important" rules 
 * take precedence over both override and author "!important" rules, and 
 * override "!important" rules take precedence over author "!important" 
 * rules. 
 * <p> The expectation is that an instance of the <code>DocumentCSS</code> 
 * interface can be obtained by using binding-specific casting methods on an 
 * instance of the <code>Document</code> interface. 
 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document Object Model (DOM) Level 2 Style Specification</a>.
 * @since DOM Level 2
 */
public interface DocumentCSS extends DocumentStyle {
    /**
     *  This method is used to retrieve the override style declaration for a 
     * specified element and a specified pseudo-element. 
     * @param elt The element whose style is to be modified. This parameter 
     *   cannot be null. 
     * @param pseudoElt The pseudo-element or <code>null</code> if none. 
     * @return  The override style declaration. 
     */
    public CSSStyleDeclaration getOverrideStyle(Element elt, 
                                                String pseudoElt);

}
