HTML forms can have various attributes that provide additional functionality and control over how the form behaves. Here are some commonly used attributes for HTML forms:

1. `action`: Specifies the URL or script to which the form data will be submitted when the form is submitted.

2. `method`: Specifies the HTTP method to be used when submitting the form. The two most commonly used methods are "GET" and "POST". "GET" appends the form data to the URL as query parameters, while "POST" sends the data in the request body.

3. `target`: Specifies the target window or frame where the form response will be displayed. The default is usually "_self", which opens the response in the same window or frame. Other options include "_blank" for a new window, or a specific frame name.

4. `enctype`: Specifies how the form data should be encoded and sent to the server. The default value is "application/x-www-form-urlencoded", which URL encodes the data. Another option is "multipart/form-data", commonly used when uploading files.

5. `autocomplete`: Specifies whether the browser should autocomplete form inputs. The values can be "on" or "off". For sensitive information like passwords, it's common to set `autocomplete="off"`.

6. `novalidate`: Specifies that the form should not be validated by the browser. This attribute is useful when you want to handle form validation on the server-side.

7. `required`: Specifies that an input field must be filled in before the form can be submitted. It can be added to individual input elements, such as `<input type="text" required>`, to enforce mandatory fields.

8. `disabled`: Disables the form or individual input elements, making them uneditable and preventing them from being submitted.

9. `name`: Specifies the name of the form, which can be used to reference the form in JavaScript or server-side processing.

10. `id`: Provides a unique identifier for the form, which can be used for CSS styling or JavaScript manipulation.

These are just a few of the attributes available for HTML forms. There are more attributes and elements that can be used to customize the behavior and appearance of forms, depending on the specific requirements of your web application.

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