2.2.43 [CSS-Level2-2009] Section 12.4.1, Nested counters and scope
The specification states:
If 'counter-increment' or 'content' on an element or pseudo-element refers to a counter that is not in the scope of any 'counter-reset', implementations should behave as though a 'counter-reset' had reset the counter to 0 on that element or pseudo-element.
Quirks Mode and IE7 Mode (All Versions)
The counter-increment property is not supported.