MutationRecord

The MutationRecord is a read-only interface that represents an individual DOM mutation observed by a MutationObserver. It is the object inside the array passed to the callback of a MutationObserver.

Instance properties

• addedNodes Read only
  • : The nodes added by a mutation. Will be an empty NodeList if no nodes were added.
• attributeName Read only
  • : The name of the changed attribute as a string, or null.
• attributeNamespace Read only
  • : The namespace of the changed attribute as a string, or null.
• nextSibling Read only
  • : The next sibling of the added or removed nodes, or null.
• oldValue Read only
  • : The value depends on the 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.
• previousSibling Read only
  • : The previous sibling of the added or removed nodes, or null.
• removedNodes Read only
  • : The nodes removed by a mutation. Will be an empty NodeList if no nodes were removed.
• target Read only
  • : 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.
• type Read only
  • : A string representing the type of mutation: 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.

Specifications

Browser compatibility