CSS Test   What will be the output of the following code? <style> .foo { width:100px; height:50px; border-width:3px; -webkit-border-image: -webkit-gradient(linear, 0 0, 0 100%, from(black), to(red)) 1 100%; -webkit-border-image: -webkit-linear-gradient(black, red) 1 100%; -o-border-image: -o-linear-gradient(black, red)) 1 100%; -moz-border-image: -moz-linear-gradient(black,…