MutationEvent: initMutationEvent() method
Deprecated
To be removed
This feature is pending removal from browsers. Using it now may lead to broken functionality in future updates. Mutation events negatively impact performance and they were selected for removal from the web as part of Interop 2025.
Use the following features instead: MutationObserver.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The initMutationEvent() method of the MutationEvent interface initializes the
value of a mutation event once it's been created (normally using the Document.createEvent() method).
This method must be called to set the event before it is dispatched, using EventTarget.dispatchEvent().
Note: In general, you won't create these events yourself; they are created by the browser.
Syntax
initMutationEvent(type, canBubble, cancelable, relatedNode,
prevValue, newValue, attrName, attrChange)
Parameters
type-
A string to set the event's
typeto. Browsers set the following values forMutationEvent:DOMAttrModified,DOMAttributeNameChanged,DOMCharacterDataModified,DOMElementNameChanged,DOMNodeInserted,DOMNodeInsertedIntoDocument,DOMNodeRemoved,DOMNodeRemovedFromDocument,DOMSubtreeModified. canBubble-
A boolean indicating whether or not the event can bubble. Sets the value of
Event.bubbles. cancelable-
A boolean indicating whether or not the event's default action can be prevented. Sets the value of
Event.cancelable. -
A string representing the new value of the modified node, if any. Sets the value of
MutationEvent.relatedNode. prevValue-
A string representing the previous value of the modified node, if any. Sets the value of
MutationEvent.prevValue. newValue-
A string representing the new value of the modified node, if any. Sets the value of
MutationEvent.newValue. attrName-
A string representing the name of the
Attrnode changed, if any. Sets the value ofMutationEvent.attrName. attrChange-
An integer representing the reason attribute node changed. Sets the value of
MutationEvent.attrChange.
Return value
None (undefined).