Recent Features
![Page Visibility API]()
Page Visibility API
One event that's always been lacking within the document is a signal for when the user is looking at a given tab, or another tab. When does the user switch off our site to look at something else? When do they come back?
![Responsive and Infinitely Scalable JS Animations]()
Responsive and Infinitely Scalable JS Animations
Back in late 2012 it was not easy to find open source projects using
requestAnimationFrame()- this is the hook that allows Javascript code to synchronize with a web browser's native paint loop. Animations using this method can run at 60 fps and deliver fantastic...
Incredible Demos
![Using TogetherJS]()
Using TogetherJS
Last week I highlighted five awesome Mozilla technologies that most people have never heard of. Before the Mozilla Summit in Santa Clara, even I (a Mozilla employee) had not heard of a few of them. One of the projects I was most impressed by...
![CSS Tooltips]()
CSS Tooltips
We all know that you can make shapes with CSS and a single HTML element, as I've covered in my CSS Triangles and CSS Circles posts. Triangles and circles are fairly simply though, so as CSS advances, we need to stretch the boundaries...




