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This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Object. It is returned or used as an argument by
Node.getUserData(), used as the third argument to
UserDataHandler, and is used or returned by various
DOMUserData is not persisted nor serialized and will not be present after the application has restarted or after a crash. If you are interested in persisting data you might rather need to use
|Document Object Model (DOM) Level 3 Core Specification
The definition of 'DOMUserData' in that specification.