MutationEvent

void initMutationEvent(
    in DOMString type, 
    in boolean canBubble, 
    in boolean cancelable, 
    in Node relatedNode, 
    in DOMString prevValue, 
    in DOMString newValue, 
    in DOMString attrName, 
    in unsigned short attrChange); 

const unsigned short ADDITION = 2; 

readonly attribute unsigned short attrChange; 

readonly attribute DOMString attrName; 

const unsigned short MODIFICATION = 1; 

readonly attribute DOMString newValue; 

readonly attribute DOMString prevValue; 

readonly attribute Node relatedNode; 

const unsigned short REMOVAL = 3;