Unlike the 2.x branch, version 3.x doesn't represent a complete rewrite from its previous version. In fact, most of the PHP code for creating and validating forms has remained unchanged in this new major version release. So, what's different? The most significant enhancement is the integration with Bootstrap - a front-end framework from Twitter. Bootstrap incorporates responsive CSS, which means your forms not only look and behave great in the latest desktop browser, but in tablet and smartphone browsers as well. Another enhancement in version 3.x is the addition of 13 HTML5 elements, which you can check out in our HTML5 example. HTML5 form elements and attributes improve your form's usability - especially on tablets and smartphones where data is inputted with virtual keyboards.