Thanks for checking out this Internet Explorer 10 Platform Preview demo. This demo uses animation techniques to render a stormy summer evening. Fireflies fly around the screen as rain falls and thunder echos in the distance. The more powerful the underlying computer and the browser, the more fireflies will appear, and the animation will be faster and smoother. This demo uses HTML5 Canvas, HTML5 Audio and HTML5 Video. It's a fun way to demonstrate how Internet Explorer 10's overall performance, from hardware accelerated graphics, to compiled javascript, to hardware accelerated canvas, will enable a new generation of HTML5 applications. The purpose of these demos is to convey a concept and is not intended to be used as a best practice for web development.