With CORS, you can securely upload files directly into an S3 bucket, directly from the browser, without using an intermediate proxy (e.g. your web server).
HTML5 form validation
HTML5 and ccs3 are a really loud buzz in web design for quite some time. The new features can be really powerful tools in a developer’s arsenal. This technology can also be used in all sort of mobile devices. All modern devices have browsers that support all those new exciting features.