The HTML5 Shiv : The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari...
Parsley.js : Javascript forms validation.
Powerful, UX aware & Dead simple.
Web Forms : Web Forms 2.0 Cross-Browser Implementation
Shumway : Shumway is an HTML5 technology experiment that explores building a faithful and efficient renderer for the SWF file format without native code assista...
HTML5Forms.js : HTML5Forms.js is a JavaScript polyfill that implements a subset of the HTML5
Forms module in all browsers. The script will only add support for the
d...
Hyperform is a complete implementation of the HTML 5 form validation API in Javascript. It replaces or polyfills the browser’s native methods and eases your validation task with custom events and hooks.