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Firefox 5 was released last week. This release comes with CSS3 Animations. Here is a demo made by Anthony Calzadilla.

To illustrate what you can achieve with CSS3 Animations, we have been working on demo with Anthony Calzadilla (@acalzadilla), famous for his awesome Animation projects.

Check out the demo on the Mozilla Demo Studio.

And it works on Firefox Mobile too:

The whole animation is orchestrated in CSS (keyframe) and the moves are animated transformations (transforms). The images are nested divs. If you translated a div and rotate its child, the transformations are combined. You can see the elements being transformed (bounding boxes) if you activate the debug mode.

#arm-rt {
  /* ARM  SLIDING OUT FROM BODY */
  transform-origin: 0 50%;
  /* The syntax is:
   animation: name duration timing-function delay count direction
  */
  animation: arm-rt-action-01 60s ease-out 10s 1 both; 
}
@keyframes arm-rt-action-01 {
  /* This part of the animation starts after 10s and lasts for 60s */
  0% { transform : translate(-100px,0) rotate(0deg); }
  5% { transform : translate(0,0) rotate(0deg); }
  6% { transform : translate(0,0) rotate(-16deg); }
  21% { transform : translate(0,0) rotate(-16deg); }
  22% { transform : translate(-100px,0) rotate(0deg); }
  100% { transform : translate(-100px,0) rotate(0deg); }
}

Tip: If you want to avoid some performance issues, we encourage you to use bitmap images. SVG images can make the animation a bit shoppy.

Want to see more CSS3 Animations? Check out Anthony’s website: www.anthonycalzadilla.com. And feel free to submit your CSS3 Animations demos to the Mozilla Demo Studio.

Today, three months after the release of Firefox 4, we release Firefox 5, thanks to our new development cycle. Developers will be able to create richer animations using CSS3 Animations. This release comes with various improvements, performance optimization and bug fixes.

CSS3 Animations

CSS Animations (check out the documentation) are a new way to create animations using CSS. Like CSS Transitions, they are efficient and run smoothly (see David Baron’s article), and the developers have a better controls over the intermediate steps (keyframes), and can now create much more complex animations.

Notable changes

You can now pass an image as a parameter to createImageDatato copy its dimensions.
setTimeout and setInterval will only be able to execute callbacks once per second in inactive tabs. This follows the behavior of requestAnimationFrame to save CPU and power consumption.

Other Bug Fixes and Performance Improvements:

HTML

All HTML elements now have the accessKey attribute, as well as the blur() , click() , and focus() methods. These are specified in the HTMLElement interface.
In order to comply with the HTML5 specification, support for the UTF-7 and UTF-32 character sets has been removed.
When in quirks mode, empty <map>s are no longer skipped over in favor of non-empty ones when matching. See the Gecko notes on the <map> element for details.
Firefox mobile on Android now supports WOFF fonts for @font-face .
WebGL no longer loads textures from domains other than the originating domain, as a security measure.

Canvas improvements

The <canvas> 2D drawing context now supports specifying an ImageData object as the input to the createImageData() method; this creates a new ImageData object initialized with the same dimensions as the specified object, but still with all pixels preset to transparent black.
Specifying non-finite values when adding color stops through a call to the CanvasGradient method addColorStop() now correctly throws INDEX_SIZE_ERR instead of SYNTAX_ERR.
The HTMLCanvasElement method toDataURL() now correctly lower-cases the specified MIME type before matching.
getImageData() now correctly accepts rectangles that extend beyond the bounds of the canvas; pixels outside the canvas are returned as transparent black.
drawImage() and createImageData() now handle negative arguments in accordance with the specification, by flipping the rectangle around the appropriate axis.
Specifying non-finite values when calling createImageData() now properly throws a NOT_SUPPORTED_ERR exception.
createImageData() and getImageData() now correctly return at least one pixel’s worth of image data if a rectangle smaller than one pixel is specified.
Specifying a negative radius when calling createRadialGradient() now correctly throws INDEX_SIZE_ERR.
Specifying a null or undefined image when calling createPattern() or drawImage() now correctly throws a TYPE_MISMATCH_ERR exception.
Specifying invalid values for globalAlpha no longer throws a SYNTAX_ERR exception; these are now correctly silently ignored.
Specifying invalid values when calling translate(), transform(), rect(), clearRect(), fillRect(), strokeRect(), lineTo(), moveTo(), quadraticCurveTo(), or arc() no longer throws an exception; these calls are now correctly silently ignored.
Setting the value of shadowOffsetX, shadowOffsetY, or shadowBlur to an invalid value is now silently ignored.
Setting the value of rotate or scale to an invalid value is now silently ignored.

CSS

Support for CSS animations has been added, using the -moz- prefix for now.

DOM

The selection object’s modify() method has been changed so that the “word” selection granularity no longer includes trailing spaces; this makes it more consistent across platforms and matches the behavior of WebKit’s implementation.
The window.setTimeout() method now clamps to send no more than one timeout per second in inactive tabs. In addition, it now clamps nested timeouts to the smallest value allowed by the HTML5 specification: 4 ms (instead of the 10 ms it used to clamp to).
Similarly, the window.setInterval() method now clamps to no more than one interval per second in inactive tabs.
XMLHttpRequest now supports the loadend event for progress listeners. This is sent after any transfer is finished (that is, after the abort, error, or load event). You can use this to handle any tasks that need to be performed regardless of success or failure of a transfer.
The Blob and, by extension, the File objects’ slice() method has been removed and replaced with a new, proposed syntax that makes it more consistent with Array.slice() and String.slice() methods in JavaScript. This method is named mozSlice() for now.
The value of window.navigator.language is now determined by looking at the value of the Accept-Language HTTP header.

JavaScript

Regular expressions are no longer callable as if they were functions; this change has been made in concert with the WebKit team to ensure compatibility (see WebKit bug 28285).
The Function.prototype.isGenerator() method is now supported; this lets you determine if a function is a generator.

SVG

The class SVG attribute can now be animated.
The following SVG-related DOM interfaces representing lists of objects are now indexable and can be accessed like arrays; in addition, they have a length property indicating the number of items in the lists: SVGLengthList , SVGNumberList , SVGPathSegList , and SVGPointList.

HTTP

Firefox no longer sends the “Keep-Alive” HTTP header; we weren’t formatting it correctly, and it was redundant since we were also sending the Connection: or Proxy-Connection: header with the value “keep-alive” anyway.
The HTTP transaction model has been updated to be more intelligent about reusing connections in the persistent connection pool; instead of treating the pool as a FIFO queue, Necko now attempts to sort the pool with connections with the largest congestion window (CWND) first. This can reduce the round-trip time (RTT) of HTTP transactions by avoiding the need to grow connections’ windows in many cases.
Firefox now handles the Content-Disposition HTTP response header more effectively if both the filename and filename* parameters are provided; it looks through all provided names, using the filename* parameter if one is available, even if a filename parameter is included first. Previously, the first matching parameter would be used, thereby preventing a more appropriate name from being used. See bug 588781 .

MathML

Support for embellished operators

Developer tools

The Web Console’s Console object now has a debug() method, which is an alias for its log() method; this improves compatibility with certain existing sites.

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