Web Code Tools is a powerhouse of tools for making HTML/CSS easy. It includes many amazing tools for CSS3, HTML5, Microdata, Meta Tags, Facebook Opengraph, Twitter Card etc.
CSS 3 generator includes animation, background gradients, border radius, box shadow, layout, transitions and many more. Similarly HTML 5 generators includes wide variety of elements, attributes etc.
The website provides a simple WYSIWYG editor where you can input the data and properties to preview it before you export the code for your projects.WebCodeTools
Take a peek into the features available at the website which is also available as a chrome extension too.