Hi,
Currently we do only support editing document created in GWD, but we are outputting HTML, CSS and JS. We only add some author time data in order to enhance the authoring experience but otherwise everything else is just plain HTML and CSS. Our minified JS is only added for the Ads use case and to support the rendering of Canvas shapes.
Also we are still in Beta and we are working on adding many more features for our 1.0 release. Feel free to submit any features request through our public forums.
Also we are still in Beta and we are working on adding many more features for our 1.0 release. Feel free to submit any features request through our public forums.
Thanks, Google Web Designer team.