/**
* Appends a child node at the given index
*
* @param index insert point
* @param child node to be appended
* @return the node
*/
public Sup appendChild(int index, Node child) {
if (this == child) {
throw new Error("Cannot append a node to itself.");
}
child.setParent(this);
children.add(index, child);
return this;
}
/**
* Appends a child node to the end of this element's DOM tree
*
* @param child node to be appended
* @return the node
*/
public Frameset appendChild(Node child) {
if (this == child) {
throw new Error("Cannot append a node to itself.");
}
child.setParent(this);
children.add(child);
return this;
}