Form validation when the field is optional

1. How do you indicate an optional field?
2. How do I bypass required field validation in HTML?
3. How validate field is mandatory in JavaScript?

How do you indicate an optional field?

A simple way to show optional fields is to put '(optional)' within the question's label.

How do I bypass required field validation in HTML?

To ignore HTML validation, you can remove the attribute on button click using JavaScript. Uer removeAttribute() to remove an attribute from each of the matched elements.

How validate field is mandatory in JavaScript?

Basic Validation − First of all, the form must be checked to make sure all the mandatory fields are filled in. It would require just a loop through each field in the form and check for data. Data Format Validation − Secondly, the data that is entered must be checked for correct form and value.