R1:30257515eb34

Fix typo in CSS definition

Summary: Replace `-webkit-trasform` with `-webkit-transform`.

Test Plan: Read the entire CSS spec at your fireplace.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25707