Your visitors come from everywhere using different browsers to view your site. I know how important it is to have a theme with major browsers supported. Before I release this theme, I tested it rigorously on 6 most commonly-used browsers, namely IE7, IE8, Firefox, Safari, Opera and Chrome!! This accounts for 95% of browsers used by all internet users.
If any of my themes are not supporting any one of the browsers stated above, please let me know and I’ll look into it.