A B C D E F G H I L M N O P R S T U V W

## U

UIEvent - Interface in org.w3c.dom.events
  The `UIEvent` interface provides specific contextual information associated with User Interface events.
UserDataHandler - Interface in org.w3c.dom
  When associating an object to a key on a node using `Node.setUserData()` the application can provide a handler that gets called when the node the object is associated to is being cloned, imported, or renamed.
UNKNOWN_RULE - Static variable in interface org.w3c.dom.css.CSSRule
  The rule is a `CSSUnknownRule`.
UNSPECIFIED_EVENT_TYPE_ERR - Static variable in exception org.w3c.dom.events.EventException
  If the `Event`'s type was not specified by initializing the event before the method was called.

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