2.3.1 [UserTiming:2013] Section 4.2, Extensions to the Performance Interface

E0001:

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML (All Versions)

The getMarks method, which is not in [UserTiming:2013], is supported.

E0002:

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML (All Versions)

The getMeasures method, which is not in [UserTiming:2013], is supported.