What is the standard requirement of stair step width

What is the standard requirement of stair step width

1、 The clear width of each flight of indoor stairs shall not be less than 1.40M, the height of step shall not be more than 0.16m, and the width of step shall not be less than 0.28M;
2、 The step height of outdoor steps shall not be greater than 0.15m, and the step width shall not be less than 0.30m