title: Which HTML5 forms javascript polyfill to has the broadest feature and browser reach?
body: <p>The new forms attributes and tags in HTML5 are great.  Unfortunately, there is only limited support for these in Chrome and Firefox, and essentially no support of these in IE9 and below.</p>
  
  <p>I have investigated using Modernizr and HTML5 polyfills to polyfill this functionality in browsers lacking native support.   However, there seems to be a large number of polyfills for HTML5 forms functionality, such as webshims lib, webforms2 and h5f (see for example the listing at <a href="https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-Browser-Polyfills" rel="nofollow noreferrer">https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-Browser-Polyfills</a>) and I am not sure which one or ones I should invest the time in learning.</p>
  
  <p>Which one of these HTML5 forms polyfills would give me the broadest coverage in terms of HTML5 features and browser coverage?</p>