HTML provides a variety of attributes that can be used with the `<input>` element to customize its behavior and appearance. Here are some commonly used input attributes in HTML:

1. `type`: Specifies the type of input. This attribute is required and determines the kind of data that can be entered or selected. For example, `type="text"`, `type="email"`, `type="password"`, etc.

2. `name`: Specifies the name of the input field. This attribute is used to identify the input when the form is submitted and is often used in server-side processing.

3. `value`: Specifies the initial value of the input field. It can be pre-filled with a default value or used to display the current value.

4. `placeholder`: Specifies a short hint or example text that is displayed in the input field before the user enters a value.

5. `required`: Specifies that the input field must be filled in before the form can be submitted.

6. `disabled`: Disables the input field, making it uneditable and preventing its value from being submitted with the form.

7. `readonly`: Makes the input field read-only, allowing users to view the value but not edit it.

8. `min` and `max`: Specifies the minimum and maximum values allowed for numeric input types, such as `number`, `range`, or `date`.

9. `step`: Specifies the increment or decrement step for numeric input types, such as `number` or `range`.

10. `autocomplete`: Specifies whether the browser should autocomplete the input field. Values can be set to "on" or "off".

11. `autofocus`: Specifies that the input field should automatically receive focus when the page loads.

12. `pattern`: Specifies a regular expression pattern that the entered value must match for the input to be considered valid.

13. `maxlength`: Specifies the maximum number of characters allowed for text input fields.

14. `size`: Specifies the width, in characters, of the input field.

These are just a few examples of the input attributes available in HTML. There are additional attributes specific to certain input types, such as `multiple` for selecting multiple files, `checked` for pre-selecting checkboxes or radio buttons, and more. The choice of attributes depends on the type of input and the desired functionality for your form.

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