Properties can be invoked as methods, or assigned to, or read.
Properties can be added or set to null.
Properties that hold methods (Function objects) can be changed to user-defined methods.
Event handlers lodged with on… style attributes, or via the DOM 2 addEventListener() method, can override handlers in the binding.
DOM 1 interfaces can set and unset attributes on the bound tag.
DOM 1 interfaces can modify the final merged content of the bound tag.
None of these actions affects the XBL binding specification for a bound binding.
The most significant issue for ...