+++ This bug was initially created as a clone of Bug #691151 +++
This is not standard and has a standard alternative (defaultPrevented property).
There is no reason to keep this around forever.
Created attachment 753617 [details] [diff] [review]
Add a deprecation warning to getPreventDefault
Reverted (see bug 691151 for details).
Fixed call sites, relanding.
Mentioned in the compatibility document:
The method has already been marked deprecated in other documents.