     /**      * This attribute returns the text content of this node and its      * descendants. When it is defined to be null, setting it has no effect.      * When set, any possible children this node may have are removed and      * replaced by a single <code>Text</code> node containing the string      * this attribute is set to. On getting, no serialization is performed,      * the returned string does not contain any markup. No whitespace      * normalization is performed, the returned string does not contain the      * element content whitespaces . Similarly, on setting, no parsing is      * performed either, the input string is taken as pure textual content.      * <br>The string returned is made of the text content of this node      * depending on its type, as defined below:      * <table border='0'>      * <tr>      * <th>Node type</th>      * <th>Content</th>      * </tr>      * <tr>      * <td valign='top' rowspan='0' colspan='0'>      * ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE,      * DOCUMENT_FRAGMENT_NODE</td>      * <td valign='top' rowspan='0' colspan='0'>concatenation of the <code>textContent</code>      * attribute value of every child node, excluding COMMENT_NODE and      * PROCESSING_INSTRUCTION_NODE nodes</td>      * </tr>      * <tr>      * <td valign='top' rowspan='0' colspan='0'>ATTRIBUTE_NODE, TEXT_NODE,      * CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE</td>      * <td valign='top' rowspan='0' colspan='0'>      * <code>nodeValue</code></td>      * </tr>      * <tr>      * <td valign='top' rowspan='0' colspan='0'>DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE</td>      * <td valign='top' rowspan='0' colspan='0'>      * null</td>      * </tr>      * </table>      * @exception DOMException      *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.      * @exception DOMException      *   DOMSTRING_SIZE_ERR: Raised when it would return more characters than      *   fit in a <code>DOMString</code> variable on the implementation      *   platform.        * @since DOM Level 0      */     public void set