This method is called on the error handler when an error occurs.
If an exception is thrown from this method, it is considered to be
equivalent of returning true.
param
error The error object that describes the error. This object
may be reused by the DOM implementation across multiple calls to
the handleError method.
return
If the handleError method returns
false, the DOM implementation should stop the current
processing when possible. If the method returns true,
the processing may continue depending on
DOMError.severity.
