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Flying Saucer is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code as well as Java2D output.

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/*
 * {{{ header & license
 * Copyright (c) 2006 Wisconsin Court System
 *
 * This program 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 2.1
 * of the License, or (at your option) any later version.
 *
 * 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 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * }}}
 */
package org.xhtmlrenderer.layout;

import org.w3c.dom.Element;
import org.xhtmlrenderer.css.style.CalculatedStyle;
import org.xhtmlrenderer.render.InlineLayoutBox;

import javax.annotation.CheckReturnValue;
import javax.annotation.Nullable;

/**
 * All objects appearing the layout tree must implement this interface.  It
 * can roughly be thought of as a styled element (although an {@link InlineLayoutBox}
 * may be split across many lines) and some {@code Styleable} objects may not
 * define an element at all (e.g. anonymous inline boxes) and some
 * {@code Styleable} objects don't correspond to a real element
 * (e.g. {@code :before} and {@code :after} pseudo-elements)
 */
public interface Styleable {
    CalculatedStyle getStyle();
    void setStyle(CalculatedStyle style);

    @Nullable
    @CheckReturnValue
    Element getElement();
    
    void setElement(Element e);

    String getPseudoElementOrClass();
}