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    MutationRecord

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    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.

    Specifications

    Specification Status Comment
    DOM
    The definition of 'MutationRecord' in that specification.    		 Living Standard  
    DOM4
    The definition of 'MutationRecord' in that specification.    		 Recommendation  

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