The HTML form passes key-value pairs to PayPal in a "variable=value" format; you are required to pass a specific action URL and some input fields.

HTML5 offers form field validation support built into the HTML form input tags that should greatly reduce the need for JavaScript validation code. In this post, I look at some examples of this.

Embed a login box in your Web page using HTML form tags. The login form displays Username and Password fields as well as a Submit button, which sends the form data to a specified script for ...