The popup mechanism allows blocks of content to be selectively displayed and positioned with respect to an anchor. It has several parts:

• StateTiddlers to record whether a popup is currently displayed or not
• The RevealWidget to selectively display the popup content
  • Introduced in v5.2.4 For positioning the popups relative or absolute coordinates can be used. See Coordinate Systems for more information about usage and format.
  • For "sticky" popups — those that don't close when clicking inside one — set the class attribute to tc-popup-keep
• The ButtonWidget to trigger the display of the popup by setting the state tiddler appropriately