I've become a huge, huge fan of icon fonts lately, for reasons well enumerated elsewhere.. However, in learning how to use them, I had to rethink how I wrote markup. For years, I've been using background images via CSS for the kinds of visual elements that I now wanted to use an icon font for.
About the code Up Arrow. Animated up arrow button style. Designed to make the action more user friendly for the end user. The text fades away and is replaced with a animation designed to hint at the effect this button will have on the site.Icon fonts contain symbols or pictograms instead of letters and numbers. These pictograms can be easily added to website content and resized using CSS. Compared to image based icons, font icons are much faster which helps with your overall WordPress website speed. Icon fonts can be used to display commonly used icons.