RELNOTES[INC]: Remove vendor-prefixing for transition* and animation* event types.
RELNOTES[INC]: Remove vendor-prefixing for transition* and animation* event types.

PiperOrigin-RevId: 407902213
Change-Id: I9efaa3ec3a11ed402989caebc953d24cf74e3475

google/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library