Mozilla Developer Preview (Gecko 1.9.3a1) available

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A Mozilla Developer Preview of improvements in the Gecko layout engine is now available for download. This is a pre-release version of the Gecko 1.9.3 platform, which forms the core of rich Internet applications such as Firefox.

This developer preview introduces several new features, including:

Support for CSS Transitions. This support is not quite complete: support for animation of transforms and gradients has not yet been implemented.
Support for SMIL Animation in SVG. Support for animating some SVG attributes is still under development and the animateMotion element isn’t supported yet.
Support for WebGL, which is disabled by default but can be enabled by changing a preference. See this blog post and this blog post for more details.
Support for the getClientRects and getBoundingClientRect methods on Range objects. See bug 396392 for details.
Support for the setCapture and releaseCapture methods on DOM elements. See bug 503943 for details.
Support for the HTML5 History.pushState() and History.replaceState() methods and the popstate event. See bug 500328 for details.
Support for the -moz-image-rect() value for background-image.

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