JS Bin is a tool for experimenting with web languages. In particular HTML, CSS and JavaScript, but JS Bin also supports other languages too (like Markdown, Jade and Sass).
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser. So here we're collecting all the shims, fallbacks, and polyfills in order to implant HTML5 functionality in browsers that don't natively support them.
VDOM is amazing, but it is still the DOM we are working with which is pretty slow. HyperHTML overcomes the drawbacks of VDOM. Here we compared both in details with examples.