Login forms are an essential part of almost every website today that desires an active user participation in the site. It is the help with these forms, the users sign in to the site for further activities like commenting on a post or buying something from an ecommerce site. Here is a list of some great HTML5 & CSS3 Login Forms that would be really useful for your site if you are planning active user subscription. An efficient HTML Login Forms should house these 3 vital elements- username, password & submit input. However, some of the login forms also allow the user to log in to the website through social media channels.