perf_alert

By David Walsh on October 27, 2020

Recent Features

By Julian ShapiroApril 28, 2014
CSS vs. JS Animation: Which is Faster?
How is it possible that JavaScript-based animation has secretly always been as fast — or faster — than CSS transitions? And, how is it possible that Adobe and Google consistently release media-rich mobile sites that rival the performance of native apps? This article serves as a point-by-point...
By David WalshDecember 10, 2012
How to Create a Twitter Card
One of my favorite social APIs was the Open Graph API adopted by Facebook. Adding just a few META tags to each page allowed links to my article to be styled and presented the way I wanted them to, giving me a bit of control...

By David WalshJanuary 2, 2013
afterscriptexecute Event
Fellow Mozillian Daniel Buchner, curator of the X-Tag project and clever developer who showed us how to detect dom node insertions using CSS animations, recently showed me a new JavaScript feature I'd never heard of: the SCRIPT element's afterscriptexecute event.
By David WalshDecember 29, 2011
CSS Circles
A while back I shared a clever technique for creating triangles with only CSS. Over the past year, I've found CSS triangles incredibly effective, especially when looking to create tooltips or design elements with a likewise pointer pattern. There's another common shape...