Cloned root element of editor Plugin can change this DOM tree to clean up the markups it added before
An optional event cache. This will be consumed by event cache API to store some expensive calculation result. So that for the same event across plugins, the result doesn't need to be calculated again
Type of this event
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Extract Content with a DOM tree event This event is triggered when getContent() is called with triggerExtractContentEvent = true Plugin can handle this event to remove the UI only markups to return clean HTML by operating on a cloned DOM tree