Estelle Weyl is a front end developer, speaker, and trainer on all things CSS, HTML and JavaScript. She is author of Mobile HTML5, co-author of HTML5 and CSS3 for the Real World with Alexis Goldstein and Louis Lazarus, and contributed to the Web Performance Daybook Volume 2. Well known for coming up with the Clown Car Technique for Responsive Foreground image, she blogs about HTML5 & CSS3 at Standardista.com, and open sources all of her training material on these topics on Github.