HTML <input> step Attribute
Example
An HTML form with an input field with a specified legal number intervals:
    <form action="/action_page.php">
  
 <input type="number" name="points" step="3">
  
 <input type="submit">
 </form>
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Definition and Usage
The step attribute specifies the interval between legal numbers in an <input> element.
Example: if step="3", legal numbers could be -3, 0, 3, 6, etc.
Tip: The step attribute can be used together with the max and min attributes to create a range of legal values.
Note: The step attribute works with the following input types: number, range, date, datetime, datetime-local, month, time and week.
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
| Attribute | |||||
|---|---|---|---|---|---|
| step | 6.0 | 10.0 | 16.0 | 5.0 | 10.6 | 
Differences Between HTML 4.01 and HTML5
The step attribute is new in HTML5.
Syntax
  <input step="number">
Attribute Values
| Value | Description | 
|---|---|
| number | Specifies the interval between legal numbers in the input field. Default is 1 | 
| any | 
❮ HTML <input> tag

