Even though I typically use British spelling and idioms I still prefer and use parenthesis because it's just clearer and less easily confused with square brackets.
She also kept typing "colour" and such in CSS. Since then I've always made sure "color" and "colour" both work whenever I add a setting of CLI for it. I wish the English-speaking folk could agree on a way to spell things; can you all maybe have a war over it or sort it out some other way?