/*
    * Copyright (c) 2002-2026 Gargoyle Software Inc.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * https://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.htmlunit.javascript.host;
  
  import static org.htmlunit.BrowserVersionFeatures.EVENT_SCROLL_UIEVENT;
  import static org.htmlunit.html.DomElement.ATTRIBUTE_NOT_DEFINED;
  import static org.htmlunit.javascript.configuration.SupportedBrowser.CHROME;
  import static org.htmlunit.javascript.configuration.SupportedBrowser.EDGE;
  import static org.htmlunit.javascript.configuration.SupportedBrowser.FF;
  import static org.htmlunit.javascript.configuration.SupportedBrowser.FF_ESR;
  
  import java.io.IOException;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  import java.util.function.Predicate;
  import java.util.regex.Pattern;
  
  import org.apache.commons.logging.LogFactory;
  import org.htmlunit.SgmlPage;
  import org.htmlunit.corejs.javascript.BaseFunction;
  import org.htmlunit.corejs.javascript.Context;
  import org.htmlunit.corejs.javascript.Function;
  import org.htmlunit.corejs.javascript.NativeObject;
  import org.htmlunit.corejs.javascript.Scriptable;
  import org.htmlunit.corejs.javascript.ScriptableObject;
  import org.htmlunit.corejs.javascript.TopLevel;
  import org.htmlunit.corejs.javascript.VarScope;
  import org.htmlunit.corejs.javascript.WithScope;
  import org.htmlunit.css.ComputedCssStyleDeclaration;
  import org.htmlunit.css.ElementCssStyleDeclaration;
  import org.htmlunit.cssparser.parser.CSSException;
  import org.htmlunit.html.DomAttr;
  import org.htmlunit.html.DomCDataSection;
  import org.htmlunit.html.DomCharacterData;
  import org.htmlunit.html.DomComment;
  import org.htmlunit.html.DomElement;
  import org.htmlunit.html.DomNode;
  import org.htmlunit.html.DomText;
  import org.htmlunit.html.HtmlElement;
  import org.htmlunit.html.HtmlElement.DisplayStyle;
  import org.htmlunit.html.HtmlTemplate;
  import org.htmlunit.javascript.HtmlUnitScriptable;
  import org.htmlunit.javascript.JavaScriptEngine;
  import org.htmlunit.javascript.configuration.JsxClass;
  import org.htmlunit.javascript.configuration.JsxConstructor;
  import org.htmlunit.javascript.configuration.JsxFunction;
  import org.htmlunit.javascript.configuration.JsxGetter;
  import org.htmlunit.javascript.configuration.JsxSetter;
  import org.htmlunit.javascript.host.css.CSSStyleDeclaration;
  import org.htmlunit.javascript.host.dom.Attr;
  import org.htmlunit.javascript.host.dom.DOMException;
  import org.htmlunit.javascript.host.dom.DOMTokenList;
  import org.htmlunit.javascript.host.dom.Node;
  import org.htmlunit.javascript.host.dom.NodeList;
  import org.htmlunit.javascript.host.event.Event;
  import org.htmlunit.javascript.host.event.EventHandler;
  import org.htmlunit.javascript.host.event.UIEvent;
  import org.htmlunit.javascript.host.html.HTMLCollection;
  import org.htmlunit.javascript.host.html.HTMLElement;
  import org.htmlunit.javascript.host.html.HTMLElement.ProxyDomNode;
  import org.htmlunit.javascript.host.html.HTMLScriptElement;
  import org.htmlunit.javascript.host.html.HTMLStyleElement;
  import org.htmlunit.javascript.host.html.HTMLTemplateElement;
  import org.htmlunit.util.StringUtils;
  import org.xml.sax.SAXException;
  
  /**
   * JavaScript host object for {@code Element}.
   *
   * @author Ahmed Ashour
   * @author Marc Guillemot
   * @author Sudhan Moghe
   * @author Ronald Brill
   * @author Frank Danek
   * @author Anton Demydenko
   *
   * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element">MDN Documentation</a>
   */
  @JsxClass(domClass = DomElement.class)
  public class Element extends Node {
  
      static final String POSITION_BEFORE_BEGIN = "beforebegin";
      static final String POSITION_AFTER_BEGIN = "afterbegin";
      static final String POSITION_BEFORE_END = "beforeend";
     static final String POSITION_AFTER_END = "afterend";
 
     private static final Pattern CLASS_NAMES_SPLIT_PATTERN = Pattern.compile("\\s");
     private static final Pattern PRINT_NODE_PATTERN = Pattern.compile(" {2}");
     private static final Pattern PRINT_NODE_QUOTE_PATTERN = Pattern.compile("\"");
 
     private NamedNodeMap attributes_;
     private Map<String, HTMLCollection> elementsByTagName_; // for performance and for equality (==)
     private int scrollLeft_;
     private int scrollTop_;
     private CSSStyleDeclaration style_;
 
     /**
      * Creates an instance of this object.
      */
     @Override
     @JsxConstructor
     public void jsConstructor() {
         super.jsConstructor();
     }
 
     /**
      * Sets the DOM node that corresponds to this JavaScript object.
      *
      * @param domNode the DOM node
      */
     @Override
     public void setDomNode(final DomNode domNode) {
         super.setDomNode(domNode);
 
         final Window window = getWindow();
         setParentScope(new WithScope(getTopLevelScope(getParentScope()), window.getDocument()));
         // CSSStyleDeclaration uses the parent scope
         style_ = new CSSStyleDeclaration(this, new ElementCssStyleDeclaration(getDomNodeOrDie()));
 
         // Convert JavaScript snippets defined in the attribute map to executable event handlers.
         // Should be called only on construction.
         final DomElement htmlElt = (DomElement) domNode;
         for (final DomAttr attr : htmlElt.getAttributesMap().values()) {
             final String eventName = StringUtils.toRootLowerCase(attr.getName());
             if (eventName.startsWith("on")) {
                 createEventHandler(eventName.substring(2), attr.getValue());
             }
         }
     }
 
     /**
      * Creates the event handler function from the attribute value.
      *
      * @param eventName the event name (e.g. {@code onclick})
      * @param attrValue the attribute value
      */
     protected void createEventHandler(final String eventName, final String attrValue) {
         final DomElement htmlElt = getDomNodeOrDie();
 
         // TODO: check that it is an "allowed" event for the browser, and take care to the case
         final BaseFunction eventHandler = new EventHandler(htmlElt, eventName, attrValue);
         eventHandler.setPrototype(ScriptableObject.getClassPrototype(getParentScope(), "Function"));
 
         setEventHandler(eventName, eventHandler);
     }
 
     /**
      * Returns the tag name of this element.
      *
      * @return the tag name
      */
     @JsxGetter
     public String getTagName() {
         return getNodeName();
     }
 
     /**
      * Returns the attributes of this XML element.
      *
      * @return the attributes of this XML element
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/attributes">MDN Documentation</a>
      */
     @Override
     @JsxGetter
     public NamedNodeMap getAttributes() {
         if (attributes_ == null) {
             attributes_ = createAttributesObject();
         }
         return attributes_;
     }
 
     /**
      * Creates the JS object for the {@code attributes} property. This object will be cached.
      *
      * @return the JS object
      */
     protected NamedNodeMap createAttributesObject() {
         return new NamedNodeMap(getDomNodeOrDie());
     }
 
     /**
      * Returns the value of the specified attribute, or {@code null} if the attribute is not defined.
      *
      * @param attributeName the name of the attribute to retrieve
      * @return the value of the specified attribute, or {@code null} if not defined
      */
     @JsxFunction
     public String getAttribute(final String attributeName) {
         String value = getDomNodeOrDie().getAttribute(attributeName);
 
         if (ATTRIBUTE_NOT_DEFINED == value) {
             value = null;
         }
 
         return value;
     }
 
     /**
      * Sets the specified attribute to the given value.
      *
      * @param name the name of the attribute to set
      * @param value the value to set the attribute to
      */
     @JsxFunction
     public void setAttribute(final String name, final String value) {
         getDomNodeOrDie().setAttribute(name, value);
     }
 
     /**
      * Returns all descendant elements with the specified tag name.
      *
      * @param tagName the tag name to search for
      * @return all descendant elements with the specified tag name
      */
     @JsxFunction
     public HTMLCollection getElementsByTagName(final String tagName) {
         if (elementsByTagName_ == null) {
             elementsByTagName_ = new HashMap<>();
         }
 
         final String searchTagName;
         final boolean caseSensitive;
         final DomNode dom = getDomNodeOrNull();
         if (dom == null) {
             searchTagName = StringUtils.toRootLowerCase(tagName);
             caseSensitive = false;
         }
         else {
             final SgmlPage page = dom.getPage();
             if (page != null && page.hasCaseSensitiveTagNames()) {
                 searchTagName = tagName;
                 caseSensitive = true;
             }
             else {
                 searchTagName = StringUtils.toRootLowerCase(tagName);
                 caseSensitive = false;
             }
         }
 
         HTMLCollection collection = elementsByTagName_.get(searchTagName);
         if (collection != null) {
             return collection;
         }
 
         final DomNode node = getDomNodeOrDie();
         collection = new HTMLCollection(node, false);
         if (StringUtils.equalsChar('*', tagName)) {
             collection.setIsMatchingPredicate((Predicate<DomNode> & Serializable) nodeToMatch -> true);
         }
         else {
             collection.setIsMatchingPredicate(
                     (Predicate<DomNode> & Serializable) nodeToMatch -> {
                         if (caseSensitive) {
                             return searchTagName.equals(nodeToMatch.getNodeName());
                         }
                         return searchTagName.equalsIgnoreCase(nodeToMatch.getNodeName());
                     });
         }
 
         elementsByTagName_.put(tagName, collection);
 
         return collection;
     }
 
     /**
      * Retrieves an attribute node by name.
      *
      * @param name the name of the attribute to retrieve
      * @return the {@link Attr} node with the specified name, or {@code null} if there is no such attribute
      */
     @JsxFunction
     public HtmlUnitScriptable getAttributeNode(final String name) {
         final Map<String, DomAttr> attributes = getDomNodeOrDie().getAttributesMap();
         for (final DomAttr attr : attributes.values()) {
             if (attr.getName().equals(name)) {
                 return attr.getScriptableObject();
             }
         }
         return null;
     }
 
     /**
      * Returns a live {@link HTMLCollection} of elements with the given tag name belonging to the given namespace.
      *
      * @param namespaceURI the namespace URI of elements to look for
      * @param localName the local name of elements to look for, or {@code "*"} to match all elements
      * @return a live {@link HTMLCollection} of found elements in document order
      */
     @JsxFunction
     public HTMLCollection getElementsByTagNameNS(final Object namespaceURI, final String localName) {
         final HTMLCollection elements = new HTMLCollection(getDomNodeOrDie(), false);
         elements.setIsMatchingPredicate(
                 (Predicate<DomNode> & Serializable)
                 node -> ("*".equals(namespaceURI) || Objects.equals(namespaceURI, node.getNamespaceURI()))
                                 && ("*".equals(localName) || Objects.equals(localName, node.getLocalName())));
         return elements;
     }
 
     /**
      * Returns {@code true} when an attribute with the given name is specified on this element or has a default value.
      *
      * @param name the name of the attribute to look for
      * @return {@code true} if the attribute exists or has a default value
      */
     @JsxFunction
     public boolean hasAttribute(final String name) {
         return getDomNodeOrDie().hasAttribute(name);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxFunction
     public boolean hasAttributes() {
         return super.hasAttributes();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public DomElement getDomNodeOrDie() {
         return (DomElement) super.getDomNodeOrDie();
     }
 
     /**
      * Removes the attribute with the specified name.
      *
      * @param name the name of the attribute to remove
      */
     @JsxFunction
     public void removeAttribute(final String name) {
         getDomNodeOrDie().removeAttribute(name);
     }
 
     /**
      * Returns the bounding rectangle of this element relative to the viewport.
      *
      * @return a {@link DOMRect} object describing the element's size and position
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect">MDN Documentation</a>
      */
     @JsxFunction
     public DOMRect getBoundingClientRect() {
         final DOMRect textRectangle = new DOMRect(1, 1, 0, 0);
         textRectangle.setParentScope(getTopLevelScope(getParentScope()));
         textRectangle.setPrototype(getPrototype(textRectangle.getClass()));
         return textRectangle;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public int getChildElementCount() {
         return getDomNodeOrDie().getChildElementCount();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public Element getFirstElementChild() {
         return super.getFirstElementChild();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public Element getLastElementChild() {
         return super.getLastElementChild();
     }
 
     /**
      * Returns the next sibling that is an element.
      *
      * @return the next element sibling, or {@code null} if none
      */
     @JsxGetter
     public Element getNextElementSibling() {
         final DomElement child = getDomNodeOrDie().getNextElementSibling();
         if (child != null) {
             return child.getScriptableObject();
         }
         return null;
     }
 
     /**
      * Returns the previous sibling that is an element.
      *
      * @return the previous element sibling, or {@code null} if none
      */
     @JsxGetter
     public Element getPreviousElementSibling() {
         final DomElement child = getDomNodeOrDie().getPreviousElementSibling();
         if (child != null) {
             return child.getScriptableObject();
         }
         return null;
     }
 
     /**
      * Returns the first ancestor that is an {@link Element}. Skips non-{@link Element} nodes.
      *
      * @return the parent element
      * @see #getParent()
      */
     @Override
     public Element getParentElement() {
         Node parent = getParent();
         while (parent != null && !(parent instanceof Element)) {
             parent = parent.getParent();
         }
         return (Element) parent;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public HTMLCollection getChildren() {
         return super.getChildren();
     }
 
     /**
      * Returns the token list of the {@code class} attribute.
      *
      * @return the token list of the {@code class} attribute
      */
     @JsxGetter
     public DOMTokenList getClassList() {
         return new DOMTokenList(this, "class");
     }
 
     /**
      * Returns the value of the specified attribute in the given namespace,
      * or {@code null} if the attribute is not defined.
      *
      * @param namespaceURI the namespace URI
      * @param localName the local name of the attribute to retrieve
      * @return the attribute value, or {@code null} if not found
      */
     @JsxFunction
     public String getAttributeNS(final String namespaceURI, final String localName) {
         final String value = getDomNodeOrDie().getAttributeNS(namespaceURI, localName);
         if (ATTRIBUTE_NOT_DEFINED == value) {
             return null;
         }
         return value;
     }
 
     /**
      * Returns {@code true} if the element has an attribute with the given namespace URI and local name.
      *
      * @param namespaceURI the namespace URI
      * @param localName the local name of the attribute to look for
      * @return {@code true} if the attribute exists
      */
     @JsxFunction
     public boolean hasAttributeNS(final String namespaceURI, final String localName) {
         return getDomNodeOrDie().hasAttributeNS(namespaceURI, localName);
     }
 
     /**
      * Sets the attribute with the given namespace URI and qualified name to the given value.
      *
      * @param namespaceURI the namespace URI
      * @param qualifiedName the qualified name of the attribute
      * @param value the new attribute value
      */
     @JsxFunction
     public void setAttributeNS(final String namespaceURI, final String qualifiedName, final String value) {
         getDomNodeOrDie().setAttributeNS(namespaceURI, qualifiedName, value);
     }
 
     /**
      * Removes the attribute with the given namespace URI and local name.
      *
      * @param namespaceURI the namespace URI of the attribute to remove
      * @param localName the local name of the attribute to remove
      */
     @JsxFunction
     public void removeAttributeNS(final String namespaceURI, final String localName) {
         getDomNodeOrDie().removeAttributeNS(namespaceURI, localName);
     }
 
     /**
      * Sets the attribute node for the specified attribute, replacing the existing node if present.
      *
      * @param newAtt the attribute node to set
      * @return the replaced attribute node, if any
      */
     @JsxFunction
     public Attr setAttributeNode(final Attr newAtt) {
         final String name = newAtt.getName();
 
         final NamedNodeMap nodes = getAttributes();
         final Attr replacedAtt = (Attr) nodes.getNamedItemWithoutSytheticClassAttr(name);
         if (replacedAtt != null) {
             replacedAtt.detachFromParent();
         }
 
         final DomAttr newDomAttr = newAtt.getDomNodeOrDie();
         getDomNodeOrDie().setAttributeNode(newDomAttr);
         return replacedAtt;
     }
 
     /**
      * Returns a static {@link NodeList} of all descendant elements matching the given CSS selector(s).
      *
      * @param selectors the CSS selector(s)
      * @return the static node list of matching elements
      */
     @JsxFunction
     public NodeList querySelectorAll(final String selectors) {
         try {
             return NodeList.staticNodeList(getParentScope(), getDomNodeOrDie().querySelectorAll(selectors));
         }
         catch (final CSSException e) {
             throw JavaScriptEngine.asJavaScriptException(
                     getWindow(),
                     "An invalid or illegal selector was specified (selector: '"
                             + selectors + "' error: " + e.getMessage() + ").",
                     DOMException.SYNTAX_ERR);
         }
     }
 
     /**
      * Returns the first descendant element that matches the specified CSS selector,
      * or {@code null} if no matches are found.
      *
      * @param selectors the CSS selector(s)
      * @return the first matching element, or {@code null}
      */
     @JsxFunction
     public Node querySelector(final String selectors) {
         try {
             final DomNode node = getDomNodeOrDie().querySelector(selectors);
             if (node != null) {
                 return node.getScriptableObject();
             }
             return null;
         }
         catch (final CSSException e) {
             throw JavaScriptEngine.asJavaScriptException(
                     getWindow(),
                     "An invalid or illegal selector was specified (selector: '"
                             + selectors + "' error: " + e.getMessage() + ").",
                     DOMException.SYNTAX_ERR);
         }
     }
 
     /**
      * Returns the value of the {@code class} attribute.
      *
      * @return the class name
      */
     @JsxGetter(propertyName = "className")
     public String getClassName_js() {
         return getDomNodeOrDie().getAttributeDirect("class");
     }
 
     /**
      * Sets the {@code class} attribute for this element.
      *
      * @param className the new class name
      */
     @JsxSetter(propertyName = "className")
     public void setClassName_js(final String className) {
         getDomNodeOrDie().setAttribute("class", className);
     }
 
     /**
      * Returns the {@code clientHeight} property.
      *
      * @return the {@code clientHeight} property
      */
     @JsxGetter
     public int getClientHeight() {
         final ComputedCssStyleDeclaration style = getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
         return style.getCalculatedHeight(false, true);
     }
 
     /**
      * Returns the {@code clientWidth} property.
      *
      * @return the {@code clientWidth} property
      */
     @JsxGetter
     public int getClientWidth() {
         final ComputedCssStyleDeclaration style = getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
         return style.getCalculatedWidth(false, true);
     }
 
     /**
      * Returns the {@code clientLeft} property.
      *
      * @return the {@code clientLeft} property
      */
     @JsxGetter
     public int getClientLeft() {
         final ComputedCssStyleDeclaration style = getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
         return style.getBorderLeftValue();
     }
 
     /**
      * Returns the {@code clientTop} property.
      *
      * @return the {@code clientTop} property
      */
     @JsxGetter
     public int getClientTop() {
         final ComputedCssStyleDeclaration style = getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
         return style.getBorderTopValue();
     }
 
     /**
      * Returns the attribute node with the given namespace URI and local name.
      *
      * @param namespaceURI the namespace URI
      * @param localName the local name of the attribute to retrieve
      * @return the specified attribute node, or {@code null} if not found
      */
     @JsxFunction
     public HtmlUnitScriptable getAttributeNodeNS(final String namespaceURI, final String localName) {
         return getDomNodeOrDie().getAttributeNodeNS(namespaceURI, localName).getScriptableObject();
     }
 
     /**
      * Returns all descendant elements that have the specified class name(s).
      *
      * @param className the class name(s) to search for (space-separated)
      * @return all descendant elements with the specified class name(s)
      */
     @JsxFunction
     public HTMLCollection getElementsByClassName(final String className) {
         final DomElement elt = getDomNodeOrDie();
         final String[] classNames = CLASS_NAMES_SPLIT_PATTERN.split(className, 0);
 
         final HTMLCollection elements = new HTMLCollection(elt, true);
 
         elements.setIsMatchingPredicate(
                 (Predicate<DomNode> & Serializable)
                 node -> {
                     if (!(node instanceof HtmlElement)) {
                         return false;
                     }
                     String classAttribute = ((HtmlElement) node).getAttributeDirect("class");
                     if (ATTRIBUTE_NOT_DEFINED == classAttribute) {
                         return false; // probably better performance as most elements won't have a class attribute
                     }
 
                     classAttribute = " " + classAttribute + " ";
                     for (final String aClassName : classNames) {
                         if (!classAttribute.contains(" " + aClassName + " ")) {
                             return false;
                         }
                     }
                     return true;
                 });
 
         return elements;
     }
 
     /**
      * Returns a collection of {@link DOMRect} objects that describe the layout of the element's
      * content on screen. Each rectangle represents one line of the element's content.
      *
      * @return a {@link DOMRectList} describing the element's line boxes
      */
     @JsxFunction
     public DOMRectList getClientRects() {
         final TopLevel topScope = getTopLevelScope(getParentScope());
         final DOMRectList rectList = new DOMRectList();
         rectList.setParentScope(topScope);
         rectList.setPrototype(getPrototype(rectList.getClass()));
 
         if (!isDisplayNone() && getDomNodeOrDie().isAttachedToPage()) {
             final DOMRect rect = new DOMRect(0, 0, 1, 1);
             rect.setParentScope(topScope);
             rect.setPrototype(getPrototype(rect.getClass()));
             rectList.add(rect);
         }
 
         return rectList;
     }
 
     /**
      * Returns the attribute names of this element as an array of strings.
      * Returns an empty array if the element has no attributes.
      *
      * @return the attribute names as an array
      */
     @JsxFunction
     public Scriptable getAttributeNames() {
         final org.w3c.dom.NamedNodeMap attributes = getDomNodeOrDie().getAttributes();
 
         if (attributes.getLength() == 0) {
             return JavaScriptEngine.newArray(getParentScope(), 0);
         }
 
         final ArrayList<String> res = new ArrayList<>();
         for (int i = 0; i < attributes.getLength(); i++) {
             res.add(attributes.item(i).getNodeName());
         }
 
         return JavaScriptEngine.newArray(getParentScope(), res.toArray());
     }
 
     /**
      * Returns whether the {@code display} style of this element or any ancestor is {@code none}.
      *
      * @return {@code true} if the element or any ancestor has {@code display: none}
      */
     protected final boolean isDisplayNone() {
         Element element = this;
         while (element != null) {
             final CSSStyleDeclaration style = element.getWindow().getComputedStyle(element, null);
             final String display = style.getDisplay();
             if (DisplayStyle.NONE.value().equals(display)) {
                 return true;
             }
             element = element.getParentElement();
         }
         return false;
     }
 
     /**
      * Inserts the given element at the specified position relative to this element.
      *
      * @param where specifies where to insert the element; one of {@code beforebegin},
      *        {@code afterbegin}, {@code beforeend}, or {@code afterend} (case-insensitive)
      * @param insertedElement the element to insert
      * @return the inserted element
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentElement">MDN Documentation</a>
      */
     @JsxFunction
     public Node insertAdjacentElement(final String where, final Object insertedElement) {
         if (insertedElement instanceof Node insertedElementNode) {
             final DomNode childNode = insertedElementNode.getDomNodeOrDie();
             final Object[] values = getInsertAdjacentLocation(where);
             final DomNode node = (DomNode) values[0];
             final boolean append = ((Boolean) values[1]).booleanValue();
 
             if (append) {
                 node.appendChild(childNode);
             }
             else {
                 node.insertBefore(childNode);
             }
             return insertedElementNode;
         }
         throw JavaScriptEngine.reportRuntimeError("Passed object is not an element: " + insertedElement);
     }
 
     /**
      * Inserts the given text at the specified position relative to this element.
      *
      * @param where specifies where to insert the text; one of {@code beforebegin},
      *        {@code afterbegin}, {@code beforeend}, or {@code afterend} (case-insensitive)
      * @param text the text to insert
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentText">MDN Documentation</a>
      */
     @JsxFunction
     public void insertAdjacentText(final String where, final String text) {
         final Object[] values = getInsertAdjacentLocation(where);
         final DomNode node = (DomNode) values[0];
         final boolean append = ((Boolean) values[1]).booleanValue();
 
         final DomText domText = new DomText(node.getPage(), text);
         // add the new nodes
         if (append) {
             node.appendChild(domText);
         }
         else {
             node.insertBefore(domText);
         }
     }
 
     /**
      * Returns the target node and insertion mode for the given adjacent position string.
      * Used by {@link #insertAdjacentHTML(String, String)},
      * {@link #insertAdjacentElement(String, Object)}, and
      * {@link #insertAdjacentText(String, String)}.
      *
      * @param where specifies where to insert; one of {@code beforebegin},
      *        {@code afterbegin}, {@code beforeend}, or {@code afterend} (case-insensitive)
      * @return an array of [{@link DomNode} parentNode, {@link Boolean} append]
      */
     private Object[] getInsertAdjacentLocation(final String where) {
         final DomNode currentNode = getDomNodeOrDie();
         final DomNode node;
         final boolean append;
 
         // compute the where and how the new nodes should be added
         if (POSITION_AFTER_BEGIN.equalsIgnoreCase(where)) {
             if (currentNode.getFirstChild() == null) {
                 // new nodes should append to the children of current node
                 node = currentNode;
                 append = true;
             }
             else {
                 // new nodes should be inserted before first child
                 node = currentNode.getFirstChild();
                 append = false;
             }
         }
         else if (POSITION_BEFORE_BEGIN.equalsIgnoreCase(where)) {
             // new nodes should be inserted before current node
             node = currentNode;
             append = false;
         }
         else if (POSITION_BEFORE_END.equalsIgnoreCase(where)) {
             // new nodes should append to the children of current node
             node = currentNode;
             append = true;
         }
         else if (POSITION_AFTER_END.equalsIgnoreCase(where)) {
             if (currentNode.getNextSibling() == null) {
                 // new nodes should append to the children of parent node
                 node = currentNode.getParentNode();
                 append = true;
             }
             else {
                 // new nodes should be inserted before current node's next sibling
                 node = currentNode.getNextSibling();
                 append = false;
             }
         }
         else {
             throw JavaScriptEngine.reportRuntimeError("Illegal position value: \"" + where + "\"");
         }
 
         if (append) {
             return new Object[] {node, Boolean.TRUE};
         }
         return new Object[] {node, Boolean.FALSE};
     }
 
     /**
      * Parses the given text as HTML or XML and inserts the resulting nodes at the specified position.
      *
      * @param position specifies where to insert the nodes; one of {@code beforebegin},
      *        {@code afterbegin}, {@code beforeend}, or {@code afterend} (case-insensitive)
      * @param text the HTML or XML text to parse and insert
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML">MDN Documentation</a>
      */
     @JsxFunction
     public void insertAdjacentHTML(final String position, final String text) {
         final Object[] values = getInsertAdjacentLocation(position);
         final DomNode domNode = (DomNode) values[0];
         final boolean append = ((Boolean) values[1]).booleanValue();
 
         // add the new nodes
         final DomNode proxyDomNode = new ProxyDomNode(domNode.getPage(), domNode, append);
         parseHtmlSnippet(proxyDomNode, text);
     }
 
     /**
      * Moves a given node inside this element as a direct child, before a given reference node.
      *
      * @param context the JavaScript context
      * @param scope the scope
      * @param thisObj the scriptable
      * @param args the arguments passed into the method
      * @param function the function
      */
     @JsxFunction({CHROME, EDGE, FF})
     public static void moveBefore(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         Node.moveBefore(context, scope, thisObj, args, function);
     }
 
     /**
      * Parses the specified HTML source code and appends the resulting content at the specified target location.
      *
      * @param target the node indicating the position at which the parsed content should be placed
      * @param source the HTML code to parse
      */
     private static void parseHtmlSnippet(final DomNode target, final String source) {
         try {
             target.parseHtmlSnippet(source);
         }
         catch (final IOException | SAXException e) {
             LogFactory.getLog(HtmlElement.class).error("Unexpected exception occurred while parsing HTML snippet", e);
             throw JavaScriptEngine.reportRuntimeError("Unexpected exception occurred while parsing HTML snippet: "
                     + e.getMessage());
         }
     }
 
     /**
      * Returns the contents of this node as HTML, ignoring shadow DOM parameters as shadow DOM is not supported.
      *
      * @return the contents of this node as HTML
      */
     @JsxFunction
     public String getHTML() {
         // ignore the params because we have no shadow dom support so far
         return getInnerHTML();
     }
 
     /**
      * Returns the {@code innerHTML} of this element.
      *
      * @return the contents of this node as HTML
      */
     @JsxGetter
     public String getInnerHTML() {
         try {
             DomNode domNode = getDomNodeOrDie();
             if (this instanceof HTMLTemplateElement) {
                 domNode = ((HtmlTemplate) getDomNodeOrDie()).getContent();
             }
             return getInnerHTML(domNode);
         }
         catch (final IllegalStateException e) {
             throw JavaScriptEngine.typeError(e.getMessage());
         }
     }
 
     /**
      * Replaces all child elements of this element with the supplied HTML value.
      *
      * @param value the new HTML content for this element
      */
     @JsxSetter
     public void setInnerHTML(final Object value) {
         final DomElement domNode;
         try {
             domNode = getDomNodeOrDie();
         }
         catch (final IllegalStateException e) {
             throw JavaScriptEngine.typeError(e.getMessage());
         }
 
         String html = null;
         if (value != null) {
             html = JavaScriptEngine.toString(value);
             if (StringUtils.isEmptyString(html)) {
                 html = null;
             }
         }
 
         try {
             domNode.setInnerHtml(html);
         }
         catch (final IOException | SAXException e) {
             LogFactory.getLog(HtmlElement.class).error("Unexpected exception occurred while parsing HTML snippet", e);
             throw JavaScriptEngine.reportRuntimeError("Unexpected exception occurred while parsing HTML snippet: "
                     + e.getMessage());
         }
     }
 
     /**
      * Helper for {@code getInnerHTML}, reusable by {@code HTMLTemplateElement}.
      *
      * @param domNode the node to serialize
      * @return the contents of this node as HTML
      */
     protected String getInnerHTML(final DomNode domNode) {
         final StringBuilder buf = new StringBuilder();
 
         final String tagName = getTagName();
         boolean isPlain = "SCRIPT".equals(tagName);
 
         isPlain = isPlain || "STYLE".equals(tagName);
 
         // we can't rely on DomNode.asXml because it adds indentation and new lines
         printChildren(buf, domNode, !isPlain);
         return buf.toString();
     }
 
     /**
      * Returns the {@code outerHTML} of this element, including the element's own tags.
      *
      * @return the contents of this node as HTML, including the opening and closing tags
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/outerHTML">MDN Documentation</a>
      */
     @JsxGetter
     public String getOuterHTML() {
         final StringBuilder buf = new StringBuilder();
         // we can't rely on DomNode.asXml because it adds indentation and new lines
         printNode(buf, getDomNodeOrDie(), true);
         return buf.toString();
     }
 
     /**
      * Replaces this element (including all child elements) with the supplied HTML value.
      *
      * @param value the new HTML to replace this element
      */
     @JsxSetter
     public void setOuterHTML(final Object value) {
         final DomNode domNode = getDomNodeOrDie();
         final DomNode parent = domNode.getParentNode();
         if (null == parent) {
             return;
         }
 
         if (value == null) {
             domNode.remove();
             return;
         }
 
         final String valueStr = JavaScriptEngine.toString(value);
         if (valueStr.isEmpty()) {
             domNode.remove();
             return;
         }
 
         final DomNode nextSibling = domNode.getNextSibling();
         domNode.remove();
 
         final DomNode target;
         final boolean append;
         if (nextSibling != null) {
             target = nextSibling;
             append = false;
         }
         else {
             target = parent;
             append = true;
         }
 
         final DomNode proxyDomNode = new ProxyDomNode(target.getPage(), target, append);
         parseHtmlSnippet(proxyDomNode, valueStr);
     }
 
     /**
      * Serializes the children of the given node to the provided builder.
      *
      * @param builder the builder to write to
      * @param node the node whose children are to be serialized
      * @param html whether to use HTML serialization
      */
     protected final void printChildren(final StringBuilder builder, final DomNode node, final boolean html) {
         if (node instanceof HtmlTemplate template) {
 
             for (final DomNode child : template.getContent().getChildren()) {
                 printNode(builder, child, html);
             }
             return;
         }
 
         for (final DomNode child : node.getChildren()) {
             printNode(builder, child, html);
         }
     }
 
     protected void printNode(final StringBuilder builder, final DomNode node, final boolean html) {
         if (node instanceof DomComment) {
             if (html) {
                 // Remove whitespace sequences.
                 final String s = PRINT_NODE_PATTERN.matcher(node.getNodeValue()).replaceAll(" ");
                 builder.append("<!--").append(s).append("-->");
             }
         }
         else if (node instanceof DomCDataSection) {
             builder.append("<![CDATA[").append(node.getNodeValue()).append("]]>");
         }
         else if (node instanceof DomCharacterData) {
             // Remove whitespace sequences, possibly escape XML characters.
             String s = node.getNodeValue();
             if (html) {
                 s = StringUtils.escapeXmlChars(s);
             }
             builder.append(s);
         }
         else if (html) {
             final DomElement element = (DomElement) node;
             final Element scriptObject = node.getScriptableObject();
             final String tag = element.getTagName();
 
             Element htmlElement = null;
             if (scriptObject instanceof HTMLElement) {
                 htmlElement = scriptObject;
             }
             builder.append('<').append(tag);
             for (final DomAttr attr : element.getAttributesMap().values()) {
                 if (!attr.getSpecified()) {
                     continue;
                 }
 
                 final String name = attr.getName();
                 final String value = PRINT_NODE_QUOTE_PATTERN.matcher(attr.getValue()).replaceAll("&quot;");
                 builder.append(' ').append(name).append("=\"").append(value).append('\"');
             }
             builder.append('>');
             // Add the children.
             final boolean isHtml = !(scriptObject instanceof HTMLScriptElement)
                     && !(scriptObject instanceof HTMLStyleElement);
             printChildren(builder, node, isHtml);
             if (null == htmlElement || !htmlElement.isEndTagForbidden()) {
                 builder.append("</").append(tag).append('>');
             }
         }
         else {
             if (node instanceof HtmlElement element) {
                 if (StringUtils.equalsChar('p', element.getTagName())) {
                     int i = builder.length() - 1;
                     while (i >= 0 && Character.isWhitespace(builder.charAt(i))) {
                         i--;
                     }
                     builder.setLength(i + 1);
                     builder.append('\n');
                 }
                 if (!"script".equals(element.getTagName())) {
                     printChildren(builder, node, html);
                 }
             }
         }
     }
 
     /**
      * Returns whether the end tag is forbidden for this element.
      *
      * @return whether the end tag is forbidden
      * @see <a href="http://www.w3.org/TR/html4/index/elements.html">HTML 4 specs</a>
      */
     protected boolean isEndTagForbidden() {
         return false;
     }
 
     /**
      * Returns the element ID.
      *
      * @return the ID of this element
      */
     @JsxGetter
     public String getId() {
         return getDomNodeOrDie().getId();
     }
 
     /**
      * Sets the ID of this element.
      *
      * @param newId the new ID value for this element
      */
     @JsxSetter
     public void setId(final String newId) {
         getDomNodeOrDie().setId(newId);
     }
 
     /**
      * Removes the specified attribute node from this element.
      *
      * @param attribute the attribute node to remove
      */
     @JsxFunction
     public void removeAttributeNode(final Attr attribute) {
         final String name = attribute.getName();
         final String namespaceUri = attribute.getNamespaceURI();
         removeAttributeNS(namespaceUri, name);
     }
 
     /**
      * Returns the {@code scrollTop} value for this element.
      *
      * @return the {@code scrollTop} value
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop">MDN Documentation</a>
      */
     @JsxGetter
     public int getScrollTop() {
         // It's easier to perform these checks and adjustments in the getter, rather than in the setter,
         // because modifying the CSS style of the element is supposed to affect the attribute value.
         if (scrollTop_ < 0) {
             scrollTop_ = 0;
         }
         else if (scrollTop_ > 0) {
             final ComputedCssStyleDeclaration style =
                     getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
             if (!style.isScrollable(false)) {
                 scrollTop_ = 0;
             }
         }
         return scrollTop_;
     }
 
     /**
      * Sets the {@code scrollTop} value for this element.
      *
      * @param scroll the new {@code scrollTop} value
      */
     @JsxSetter
     public void setScrollTop(final int scroll) {
         scrollTop_ = scroll;
     }
 
     /**
      * Returns the {@code scrollLeft} value for this element.
      *
      * @return the {@code scrollLeft} value
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft">MDN Documentation</a>
      */
     @JsxGetter
     public int getScrollLeft() {
         // It's easier to perform these checks and adjustments in the getter, rather than in the setter,
         // because modifying the CSS style of the element is supposed to affect the attribute value.
         if (scrollLeft_ < 0) {
             scrollLeft_ = 0;
         }
         else if (scrollLeft_ > 0) {
             final ComputedCssStyleDeclaration style =
                     getWindow().getWebWindow().getComputedStyle(getDomNodeOrDie(), null);
             if (!style.isScrollable(true)) {
                 scrollLeft_ = 0;
             }
         }
         return scrollLeft_;
     }
 
     /**
      * Sets the {@code scrollLeft} value for this element.
      *
      * @param scroll the new {@code scrollLeft} value
      */
     @JsxSetter
     public void setScrollLeft(final int scroll) {
         scrollLeft_ = scroll;
     }
 
     /**
      * Returns the {@code scrollHeight} for this element.
      * Currently returns the same value as {@link #getClientHeight()}.
      *
      * @return the scroll height
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight">MDN Documentation</a>
      */
     @JsxGetter
     public int getScrollHeight() {
         return getClientHeight();
     }
 
     /**
      * Returns the {@code scrollWidth} for this element.
      * Currently returns the same value as {@link #getClientWidth()}.
      *
      * @return the scroll width
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollWidth">MDN Documentation</a>
      */
     @JsxGetter
     public int getScrollWidth() {
         return getClientWidth();
     }
 
     /**
      * Returns the style object for this element.
      *
      * @return the style object for this element
      */
     protected CSSStyleDeclaration getStyle() {
         return style_;
     }
 
     /**
      * Sets the CSS text for this element's inline style.
      *
      * @param style the new CSS style text
      */
     protected void setStyle(final String style) {
         getStyle().setCssText(style);
     }
 
     /**
      * Scrolls to a particular set of coordinates inside this element.
      *
      * @param x the horizontal pixel value to scroll to
      * @param y the vertical pixel value to scroll to
      */
     @JsxFunction
     public void scroll(final Scriptable x, final Scriptable y) {
         scrollTo(x, y);
     }
 
     /**
      * Scrolls the element by the given amount.
      *
      * @param x the horizontal pixel value to scroll by
      * @param y the vertical pixel value to scroll by
      */
     @JsxFunction
     public void scrollBy(final Scriptable x, final Scriptable y) {
         int xOff = 0;
         int yOff = 0;
         if (y != null) {
             xOff = JavaScriptEngine.toInt32(x);
             yOff = JavaScriptEngine.toInt32(y);
         }
         else {
             if (!(x instanceof NativeObject)) {
                 throw JavaScriptEngine.typeError("eee");
             }
             if (x.has("left", x)) {
                 xOff = JavaScriptEngine.toInt32(x.get("left", x));
             }
             if (x.has("top", x)) {
                 yOff = JavaScriptEngine.toInt32(x.get("top", x));
             }
         }
 
         setScrollLeft(getScrollLeft() + xOff);
         setScrollTop(getScrollTop() + yOff);
 
         fireScrollEvent(this);
     }
 
     private void fireScrollEvent(final Node node) {
         final Event event;
         if (getBrowserVersion().hasFeature(EVENT_SCROLL_UIEVENT)) {
             event = new UIEvent(node, Event.TYPE_SCROLL);
         }
         else {
             event = new Event(node, Event.TYPE_SCROLL);
             event.setCancelable(false);
         }
         event.setBubbles(false);
         node.fireEvent(event);
     }
 
     private void fireScrollEvent(final Window window) {
         final Event event;
         if (getBrowserVersion().hasFeature(EVENT_SCROLL_UIEVENT)) {
             event = new UIEvent(window.getDocument(), Event.TYPE_SCROLL);
         }
         else {
             event = new Event(window.getDocument(), Event.TYPE_SCROLL);
             event.setCancelable(false);
         }
         window.fireEvent(event);
     }
 
     /**
      * Scrolls to a particular set of coordinates inside this element.
      *
      * @param x the horizontal pixel value to scroll to
      * @param y the vertical pixel value to scroll to
      */
     @JsxFunction
     public void scrollTo(final Scriptable x, final Scriptable y) {
         int xOff;
         int yOff;
         if (y != null) {
             xOff = JavaScriptEngine.toInt32(x);
             yOff = JavaScriptEngine.toInt32(y);
         }
         else {
             if (!(x instanceof NativeObject)) {
                 throw JavaScriptEngine.typeError("eee");
             }
 
             xOff = getScrollLeft();
             yOff = getScrollTop();
             if (x.has("left", x)) {
                 xOff = JavaScriptEngine.toInt32(x.get("left", x));
             }
             if (x.has("top", x)) {
                 yOff = JavaScriptEngine.toInt32(x.get("top", x));
             }
         }
 
         setScrollLeft(xOff);
         setScrollTop(yOff);
 
         fireScrollEvent(this);
     }
 
     /**
      * Scrolls the element into the visible area of the browser window.
      * This implementation triggers the scroll event but does not actually scroll
      * (headless environment).
      */
     @JsxFunction
     public void scrollIntoView() {
         // do nothing at the moment, only trigger the scroll event
 
         // we do not really handle scrollable elements (we are headless)
         // we trigger the event for the whole parent tree (to inform all)
         Node parent = getParent();
         while (parent != null) {
             if (parent instanceof HTMLElement) {
                 fireScrollEvent(parent);
             }
 
             parent = parent.getParent();
         }
         fireScrollEvent(getWindow());
     }
 
     /**
      * Scrolls the element into the visible area if needed.
      * This is a no-op implementation.
      */
     @JsxFunction({CHROME, EDGE})
     public void scrollIntoViewIfNeeded() {
         /* do nothing at the moment */
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public String getPrefix() {
         return super.getPrefix();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public String getLocalName() {
         return super.getLocalName();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxGetter
     public String getNamespaceURI() {
         return super.getNamespaceURI();
     }
 
     /**
      * Returns the {@code onbeforecopy} event handler for this element.
      *
      * @return the {@code onbeforecopy} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnbeforecopy() {
         return getEventHandler(Event.TYPE_BEFORECOPY);
     }
 
     /**
      * Sets the {@code onbeforecopy} event handler for this element.
      *
      * @param onbeforecopy the {@code onbeforecopy} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnbeforecopy(final Object onbeforecopy) {
         setEventHandler(Event.TYPE_BEFORECOPY, onbeforecopy);
     }
 
     /**
      * Returns the {@code onbeforecut} event handler for this element.
      *
      * @return the {@code onbeforecut} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnbeforecut() {
         return getEventHandler(Event.TYPE_BEFORECUT);
     }
 
     /**
      * Sets the {@code onbeforecut} event handler for this element.
      *
      * @param onbeforecut the {@code onbeforecut} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnbeforecut(final Object onbeforecut) {
         setEventHandler(Event.TYPE_BEFORECUT, onbeforecut);
     }
 
     /**
      * Returns the {@code onbeforepaste} event handler for this element.
      *
      * @return the {@code onbeforepaste} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnbeforepaste() {
         return getEventHandler(Event.TYPE_BEFOREPASTE);
     }
 
     /**
      * Sets the {@code onbeforepaste} event handler for this element.
      *
      * @param onbeforepaste the {@code onbeforepaste} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnbeforepaste(final Object onbeforepaste) {
         setEventHandler(Event.TYPE_BEFOREPASTE, onbeforepaste);
     }
 
     /**
      * Returns the {@code onsearch} event handler for this element.
      *
      * @return the {@code onsearch} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnsearch() {
         return getEventHandler(Event.TYPE_SEARCH);
     }
 
     /**
      * Sets the {@code onsearch} event handler for this element.
      *
      * @param onsearch the {@code onsearch} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnsearch(final Object onsearch) {
         setEventHandler(Event.TYPE_SEARCH, onsearch);
     }
 
     /**
      * Returns the {@code onwebkitfullscreenchange} event handler for this element.
      *
      * @return the {@code onwebkitfullscreenchange} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnwebkitfullscreenchange() {
         return getEventHandler(Event.TYPE_WEBKITFULLSCREENCHANGE);
     }
 
     /**
      * Sets the {@code onwebkitfullscreenchange} event handler for this element.
      *
      * @param onwebkitfullscreenchange the {@code onwebkitfullscreenchange} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnwebkitfullscreenchange(final Object onwebkitfullscreenchange) {
         setEventHandler(Event.TYPE_WEBKITFULLSCREENCHANGE, onwebkitfullscreenchange);
     }
 
     /**
      * Returns the {@code onwebkitfullscreenerror} event handler for this element.
      *
      * @return the {@code onwebkitfullscreenerror} event handler for this element
      */
     @JsxGetter({CHROME, EDGE})
     public Function getOnwebkitfullscreenerror() {
         return getEventHandler(Event.TYPE_WEBKITFULLSCREENERROR);
     }
 
     /**
      * Sets the {@code onwebkitfullscreenerror} event handler for this element.
      *
      * @param onwebkitfullscreenerror the {@code onwebkitfullscreenerror} event handler for this element
      */
     @JsxSetter({CHROME, EDGE})
     public void setOnwebkitfullscreenerror(final Object onwebkitfullscreenerror) {
         setEventHandler(Event.TYPE_WEBKITFULLSCREENERROR, onwebkitfullscreenerror);
     }
 
     /**
      * Returns the {@code onwheel} event handler for this element.
      *
      * @return the {@code onwheel} event handler for this element
      */
     public Function getOnwheel() {
         return getEventHandler(Event.TYPE_WHEEL);
     }
 
     /**
      * Sets the {@code onwheel} event handler for this element.
      *
      * @param onwheel the {@code onwheel} event handler for this element
      */
     public void setOnwheel(final Object onwheel) {
         setEventHandler(Event.TYPE_WHEEL, onwheel);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     @JsxFunction
     public void remove() {
         super.remove();
     }
 
     /**
      * Sets mouse capture to the object that belongs to the current document.
      * This is a mock implementation.
      *
      * @param retargetToElement if {@code true}, all events are targeted directly to this element;
      *        if {@code false}, events can also fire at descendants of this element
      */
     @JsxFunction({FF, FF_ESR})
     public void setCapture(final boolean retargetToElement) {
         // empty
     }
 
     /**
      * Releases mouse capture from the object in the current document.
      * This is a mock implementation.
      */
     @JsxFunction({FF, FF_ESR})
     public void releaseCapture() {
         // nothing to do
     }
 
     /**
      * Inserts a set of {@link Node} or {@code DOMString} objects in the children list of this node's parent,
      * just before this node.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void before(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         Node.before(context, thisObj, args, function);
     }
 
     /**
      * Inserts a set of {@link Node} or {@code DOMString} objects in the children list of this node's parent,
      * just after this node.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void after(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         Node.after(context, thisObj, args, function);
     }
 
     /**
      * Replaces this node with a set of {@link Node} or {@code DOMString} objects.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void replaceWith(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         Node.replaceWith(context, thisObj, args, function);
     }
 
     /**
      * Returns {@code true} if the element would be selected by the specified CSS selector string.
      *
      * @param context the JavaScript context
      * @param scope the scope
      * @param thisObj the scriptable
      * @param args the arguments passed into the method
      * @param function the function
      * @return {@code true} if the element matches the selector
      */
     @JsxFunction
     public static boolean matches(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         if (!(thisObj instanceof Element)) {
             throw JavaScriptEngine.typeError("Illegal invocation");
         }
 
         final String selectorString = (String) args[0];
         try {
             final DomNode domNode = ((Element) thisObj).getDomNodeOrNull();
             return domNode != null && ((DomElement) domNode).matches(selectorString);
         }
         catch (final CSSException e) {
             throw JavaScriptEngine.asJavaScriptException(
                     (HtmlUnitScriptable) getTopLevelScope(scope).getGlobalThis(),
                     "An invalid or illegal selector was specified (selector: '"
                             + selectorString + "' error: " + e.getMessage() + ").",
                     DOMException.SYNTAX_ERR);
         }
     }
 
     /**
      * Returns {@code true} if the element would be selected by the specified CSS selector string.
      * Firefox-specific alias for {@link #matches}.
      *
      * @param context the JavaScript context
      * @param scope the scope
      * @param thisObj the scriptable
      * @param args the arguments passed into the method
      * @param function the function
      * @return {@code true} if the element matches the selector
      */
     @JsxFunction({FF, FF_ESR})
     public static boolean mozMatchesSelector(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         return matches(context, scope, thisObj, args, function);
     }
 
     /**
      * Returns {@code true} if the element would be selected by the specified CSS selector string.
      * WebKit-specific alias for {@link #matches}.
      *
      * @param context the JavaScript context
      * @param scope the scope
      * @param thisObj the scriptable
      * @param args the arguments passed into the method
      * @param function the function
      * @return {@code true} if the element matches the selector
      */
     @JsxFunction
     public static boolean webkitMatchesSelector(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         return matches(context, scope, thisObj, args, function);
     }
 
     /**
      * Traverses this element and its ancestors until it finds a node that matches the specified CSS selector.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      * @return the closest matching ancestor element, or {@code null} if none found
      */
     @JsxFunction
     public static Element closest(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         if (!(thisObj instanceof Element)) {
             throw JavaScriptEngine.typeError("Illegal invocation");
         }
 
         final String selectorString = (String) args[0];
         try {
             final DomNode domNode = ((Element) thisObj).getDomNodeOrNull();
             if (domNode == null) {
                 return null;
             }
             final DomElement elem = domNode.closest(selectorString);
             if (elem == null) {
                 return null;
             }
             return elem.getScriptableObject();
         }
         catch (final CSSException e) {
             throw JavaScriptEngine.syntaxError(
                     "An invalid or illegal selector was specified (selector: '"
                     + selectorString + "' error: " + e.getMessage() + ").");
         }
     }
 
     /**
      * Toggles a Boolean attribute on this element. If {@code force} is {@code true}, adds
      * the attribute. If {@code force} is {@code false}, removes the attribute.
      * If {@code force} is not specified, the attribute is toggled.
      *
      * @param name the name of the attribute to toggle; automatically converted to lower-case for HTML elements
      * @param force if {@code true}, adds the attribute; if {@code false}, removes it
      * @return {@code true} if the attribute is present after the call, {@code false} otherwise
      * @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/toggleAttribute">MDN Documentation</a>
      */
     @JsxFunction
     public boolean toggleAttribute(final String name, final Object force) {
         if (JavaScriptEngine.isUndefined(force)) {
             if (hasAttribute(name)) {
                 removeAttribute(name);
                 return false;
             }
             setAttribute(name, "");
             return true;
         }
         if (JavaScriptEngine.toBoolean(force)) {
             setAttribute(name, "");
             return true;
         }
         removeAttribute(name);
         return false;
     }
 
     /**
      * Inserts a set of {@link Node} objects or string objects after the last child of this element.
      * String objects are inserted as equivalent {@code Text} nodes.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void append(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         if (!(thisObj instanceof Element)) {
             throw JavaScriptEngine.typeError("Illegal invocation");
         }
 
         Node.append(context, thisObj, args, function);
     }
 
     /**
      * Inserts a set of {@link Node} objects or string objects before the first child of this element.
      * String objects are inserted as equivalent {@code Text} nodes.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void prepend(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         if (!(thisObj instanceof Element)) {
             throw JavaScriptEngine.typeError("Illegal invocation");
         }
 
         Node.prepend(context, thisObj, args, function);
     }
 
     /**
      * Replaces the existing children of this element with a specified new set of children.
      * These can be string or {@link Node} objects.
      *
      * @param context the context
      * @param scope the scope
      * @param thisObj this object
      * @param args the arguments
      * @param function the function
      */
     @JsxFunction
     public static void replaceChildren(final Context context, final VarScope scope,
             final Scriptable thisObj, final Object[] args, final Function function) {
         if (!(thisObj instanceof Element)) {
             throw JavaScriptEngine.typeError("Illegal invocation");
         }
 
         Node.replaceChildren(context, thisObj, args, function);
     }
 }