Recent Features
![fetch API]()
fetch API
One of the worst kept secrets about AJAX on the web is that the underlying API for it,
XMLHttpRequest, wasn't really made for what we've been using it for. We've done well to create elegant APIs around XHR but we know we can do better. Our effort to...![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?
Incredible Demos
![CSS Sprites]()
CSS Sprites
The idea of CSS sprites is pretty genius. For those of you who don't know the idea of a sprite, a sprite is basically multiple graphics compiled into one image. The advantages of using sprites are: Fewer images for the browser to download, which means...
![Making the Firefox Logo from HTML]()
Making the Firefox Logo from HTML
When each new t-shirt means staving off laundry for yet another day, swag quickly becomes the most coveted perk at any tech company. Mozilla WebDev had pretty much everything going for it: brilliant people, interesting problems, awesome office. Everything except a t-shirt. That had to change. The basic...

