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As a practice (not sure if it’s good), but I’ve been adding a .last to lists of things wherein I need to select the last item. I do this because I am not confident about how :last-child will work across browsers.
Do I need to worry about this in Bootstrap? Or was I wrong to worry about it in the first place?
There is no :last pseudo-class in css. You may be thinking of the :last-child pseudo-class, which is supported in IE8 and up, as well as all modern versions of Chrome, Firefox, and Safari, as well as modern mobile browsers.
Twitter Bootstrap was made as a starting point, and so long as IE7 support is not a concern, using pseudo-classes like :last-child is safe. Be sure to reference the specific pseudo classes browser support though. Here’s a nice list: http://net.tutsplus.com/tutorials/html-css-techniques/the-30-css-selectors-you-must-memorize/
EDIT: I had first-child and last-child mixed up, last-child is ie9 and up.