attributeNamespace

• Description
• Syntax
• Examples
• Links

The attributeNamespace of MutationRecord for JS returns the namespace of the changed attribute; otherwise null.

record.attributeNamespace

• addedNodes
• attributeName
• nextSibling
• oldValue
• previousSibling
• removedNodes
• target
• type

• Web Hypertext Application Technology Working Group (WHATWG)