The HTML step attribute
Quick answer
The HTML step attribute sets the granularity (allowed interval) of the value. It is used on the <input> element (number, range, date and time types).
Overview
The step attribute sets the value increment for numeric/date inputs. It is used on form controls such as <input>, <select> and <textarea>.
It is a form-control attribute: it configures how a control behaves, what it accepts, or its initial value, working alongside the control's <label> and parent <form>. Constraint attributes also feed the browser's built-in validation.
Syntax
<input type="number" step="0.5">Values
| Value |
|---|
A positive number, or any. |
Example
<input type="number" step="0.5" min="0" max="5" value="2.5" style="padding:8px;">Best practices
- Give every control a <label> so it has an accessible name.
- Treat client-side constraints as a convenience — always validate again on the server, since they can be bypassed.
- Choose the most specific input type so users get the right on-screen keyboard and built-in checks.
- Keep the submitted name and value meaningful for whatever processes the form.
Frequently asked questions
What does the step attribute do?
Sets the value increment for numeric/date inputs.
Are HTML form attributes enough for validation?
They give instant feedback, but client-side checks can be bypassed, so always validate on the server too.
Do form controls still need a label?
Yes. Every control needs a <label> for an accessible name, whatever attributes you set.
Which elements use the step attribute?
It is an element-specific attribute, used on form controls such as <input>, <select> and <textarea>.