Use Google Web Designer to create interactive HTML5-based designs and motion graphics that can run on any device. Hands-on people have all the code available behind their designs while passionate designers are free to focus on what you love to do, no HTML5 and CSS3 coding skills required.
Other features:
Users can flip back and forth to see the changes made
3D authoring environment
Built-in illustration tools available
...and more
Available on Mac 10.7.x or later, Win 7 or later, Linux (Debian/Ubuntu/Fedora/openSUSE).
Download the HTML5 design tool from: https://www.google.com/webdesigner/.