In the past two years, increased browser support has transformed CSS3 from a fringe activity for Safari geeks to a viable option for enterprise level websites.While cross-browser support is often too weak for CSS3 to hold up a site’s main design, front-end developers commonly look to CSS3 solutions for progressive enhancement in their sites. For instance, a developer might add a drop-shadow in Firefox, Safari and Chrome using -moz-box-shadow and -webkit-box-shadow, and then be comfortable with this design enhancement falling off for IE users.But wouldn’t it be great if...