Initial import of Template:PageTransitionEventProperties
Initial import of Template:PageTransitionEventProperties

https://developer.mozilla.org/en-US/docs/Template:PageTransitionEventProperties

Contributors (by MDN username):
* ethertank
* louisremi
* Sheppy

jpmedley/kumascript,jpmedley/kumascript,a2sheppy/kumascript,a2sheppy/kumascript