[pointerevents] Pull Request: Make it explicit that buttons is a bitmask.

mustaqahmed has just submitted a new pull request for 
https://github.com/w3c/pointerevents:

== Make it explicit that buttons is a bitmask. ==
Closes #4.

See https://github.com/w3c/pointerevents/pull/66

Received on Thursday, 12 May 2016 17:53:16 UTC