<!DOCTYPE html> <link rel="stylesheet" href="test-common.css"> <style type="text/css"> @counter-style a { system: extends decimal; negative: \207B; } @counter-style b { system: extends decimal; negative: '(' ')'; } </style> <ol start="-2" style="list-style-type: a"> <li><li><li><li><li> </ol> <ol start="-2" style="list-style-type: b"> <li><li><li><li><li> </ol>