Browser detection using JavaScript is a touchy subject these days.
Setting IE's font size to match the rest of the world's browsers is no easy task. Or is it? Many themers feel a need to adjust the naturally gargantuan tendency of IE's fonts, or use a CSS hack to force IE to comply with a proper box model. Unfortunately for Palm Pilot users, Blackberries, screen readers, and even older versions of Opera, turning to JavaScript browser detection is a failed proposition. There are so many different browsers and screen sizes out there that it becomes impossible to feed each one it's own unique style sheet.
The savvy themer will no doubt be asking, "Why not use one style sheet for all browsers, and then use JavaScript to feed IE it's own settings?" Good point, but there's a better way than scripting to get this done.
