Are they any library to do so?
AFAIK dataToURL('image/gif') isn't supported by any browser
A new document type (HTML5 Canvas) has been added to Animate that provides native support for creating rich and interactive HTML5 content. It means that you can use the traditional Animate timeline, workspace, and tools to create content, but produce HTML5 output.
GIFs are dull in colour As GIF files are only 8-bit, this means they can only show 256 colours. HTML5, on the other hand, has roughly 16.7 million colours to choose from. Thus, making HTML5 a more vibrant, colourful high-quality online banner ad option.
You can create animations with HTML5 by combining HTML, CSS, and JavaScript (JS), with which you can build shapes. Also, you can control animations and edit images, video, and audio by means of JS or CSS elements, all of which you then add to a drawing board, which you set up with the <canvas> element.
Canvas can't generate (animated) GIFs. You need to use a JavaScript library to do so.
There is jsgif, a JS library to generate animated GIFs: http://github.com/antimatter15/jsgif
This blog post explains the usage: http://antimatter15.com/wp/2010/07/javascript-to-animated-gif/
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