A simple register form like Facebook sign up form may only contains username, email and password. However, we may also see many complex forms out there such as survey form, visa application form, and school application form, etc. From Google Image Just like a random example form above, this survey form not only has simple text fields such as "Name" & "Email" , but it also has drop-down content and checkbox to collect the information. With Drop-down and Checkbox, people feel easy to make a choice because they don't have to think their own answers. It also help company to collect the most relevant data and analyze results. How to add those useful features on your HTML form? Radio Button/Checkbox Radio Button and Checkbox are widgets whose state you can change by clicking on them. Both of them are created using the <input> element with its "type" attribute set to the value "checkbox" or "radio" . ...