Recently I was trying to make traingles with shadows in css. There is a [css-tricks article](http://css-tricks.com/triangle-with-shadow/) on it that uses unicode icons for the triangle. It says that there might be problem with unicode icons in some browsers. I would like to what would be those problems
If the fonts listed in your CSS do not cover some character, then different browsers will use fallback fonts differently. The cure is to try and find a list of fonts that probably covers all the characters you use. The difficulty of doing this greatly depends on the characters you use.