Step 3

Please run the application, add some dummy data in the form, such as in the example below.

Click on the submit button; you will find the page's URL is appended with data similar to the following

http://127.0.0.1:5500/index.html?cnumber=111222333444&month=12&year=2021&cvv=123

The string after ? is a list of key-value properties where keys correspond to the name attribute of the <input> fileds. The values correspond to the values you entered into the form. The key-value pairs are separated with &. This pattern is used to submit form data to a server for processing, and it can be modified.

The user input is most often sent to a server for processing.

Notice that each input field must have a name attribute to be submitted. If the name attribute is omitted, the input field's value will not be submitted.