count</code> exceeds the <code>length</code>, then all 16-bit 
   units to the end of the data are returned.<DT><B>Throws:</B><DD><CODE>org.w3c.dom.DOMException</CODE> - INDEX_SIZE_ERR: Raised if the specified <code>offset</code> is 
   negative or greater than the number of 16-bit units in 
   <code>data</code>, or if the specified <code>count</code> is 
   negative.
   <br>DOMSTRING_SIZE_ERR: Raised if the specified range of text does 
   not fit into a <code>DOMString</code>.</DL>
</DD>
</DL>
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