This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
The new pattern for programmatic event creation adopted eg by DOM4, HTML5, etc. is to define constructors for events instead of init*Event methods. For example, ProgressEvent is defined in this new style: <http://www.w3.org/TR/2011/WD-progress-events-20110809/#interface-progressevent> The TransitionEvent should have a constructor and the initTransitionEvent method should be removed.
Fixed in https://dvcs.w3.org/hg/csswg/rev/3c4df823dd45