Using a Data URI he injects an SVG as the url for the border-image CSS property. That SVG itself is then animated using a self-contained tad of inline CSS.
(Yes, that’s CSS-in-CSS 😉)
About the author
Bramus is a Freelance Web Developer from Belgium. From the moment he discovered view-source at the age of 14 (way back in 1997), he fell in love with the web and has been tinkering with it ever since (more …)