Web/API/MutationRecord

A MutationRecord represents an individual DOM mutation. It is the object that is passed to MutationObserver's callback.

Properties

Property	Type	Description
MutationRecord.type	String	Returns "attributes" if the mutation was an attribute mutation, "characterData" if it was a mutation to a CharacterData node, and "childList" if it was a mutation to the tree of nodes.
MutationRecord.target	Node	Returns the node the mutation affected, depending on the MutationRecord.type. For attributes, it is the element whose attribute changed. For characterData, it is the CharacterData node. For childList, it is the node whose children changed.
MutationRecord.addedNodes	NodeList	Return the nodes added. Will be an empty NodeList if no nodes were added.
MutationRecord.removedNodes	NodeList	Return the nodes removed. Will be an empty NodeList if no nodes were removed.
MutationRecord.previousSibling	Node	Return the previous sibling of the added or removed nodes, or null.
MutationRecord.nextSibling	Node	Return the next sibling of the added or removed nodes, or null.
MutationRecord.attributeName	String	Returns the local name of the changed attribute, or null.
MutationRecord.attributeNamespace	String	Returns the namespace of the changed attribute, or null.
MutationRecord.oldValue	String	The return value depends on the MutationRecord.type. For attributes, it is the value of the changed attribute before the change. For characterData, it is the data of the changed node before the change. For childList, it is null. Note that for this to work as expected, attributeOldValue or characterDataOldValue must be set to true in the corresponding MutationObserverInit parameter of the MutationObserver observe method

Specifications

Specification	Status	Comment
DOMThe definition of 'MutationRecord' in that specification.	Living Standard

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
MutationRecord	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
addedNodes	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
attributeName	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
attributeNamespace	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
nextSibling	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
oldValue	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
previousSibling	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
removedNodes	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
target	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes
type	Chrome Full support Yes	Edge Full support 12	Firefox Full support Yes	IE ?	Opera Full support Yes	Safari Full support Yes	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support  

Full support

Compatibility unknown  

Compatibility unknown

MutationRecord by Mozilla Contributors is licensed under CC-BY-SA 2.5.