How do you make an input field required?

Difficulty: 2/10

HTML forms, validation, accessibility

Making an Input Field Required in HTML

In HTML, you can make an input field required by adding the required attribute. This ensures that the user cannot submit the form without filling in that field. It’s a feature of native form validation and works without JavaScript.

Key Points About required

1
The required attribute can be added to <input>, <textarea>, and <select> elements.
2
If left empty, the browser will block form submission and show a validation error.
3
It improves user experience by preventing incomplete form submissions.
4

Example of required Attribute

Scenario Questions

0-2 years experience

2-5 years experience

1We have a form that uses both HTML5 validation and a JavaScript library for custom checks. The required attribute on the phone number field stopped working after we added a custom onsubmit handler. How would you troubleshoot and fix it?

Follow-up Questions