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Supports the optional "Events", "UIEvents", "MouseEvents", "MutationEvents", and "HTMLEvents" features of the DOM Level 2 Recommendation.

Note that apart from the basic "Events" infrastructure and the "MutationEvents", all other events currently defined in the DOM specification imply having some user interface that issues various events to the DOM. Also, to fully support the "UIEvents" and its child event set "MouseEvents", the DOM implementation must also support the "Views" feature.