The checkbox should include a unique id value. W3Schools is optimized for learning, testing, and training. It is the responsibility of the server to handle this key/value relationship. There is no required value for the checked attribute.However, per the checkbox specification only an empty value or 'checked' are valid.When checked is added to the checkbox element the browser will render it as selected.When a form is submitted or serialized a checkbox's value is associated with the name of the checkbox. I think this is becaue they assume, on a touch screen specifically they are a single button. I have been there too, so I empathize with everyone.As far as the checkbox user interface you should include a checkbox and label element, in that order. The different input types are as follows: For example, a spaghettie and meatball grocery list might use:Notice how each one start with the same value, 'spaghettie-meatballs-'? There is no default value. HTML Checkboxes Selected. HTML / HTML Web Forms Tutorial For Coding Beginners / How To Use Input To Create Form Fields In HTML: Easy Tutorial / How To Define Input Type In HTML (All The Values And Attributes) / Handling Checkbox Data With In HTML: Here's How Checkboxes are used to let a user select one or more options of a limited number of choices. Checkboxes are a type of input element, and some aspects of their behaviour is unique and needs to be understood when deciding whether, and how to use them. The element is the most important form element. Learn how to create custom checkboxes and radio buttons with CSS.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: It allows the user to select one or more option among all the limited choices. This means your server-side processing code needs to be robust enough to handle this null or empty state.You want to trigger a real-time response to a change in checked state. The most common is when a checkbox is available that "owns" a number of sub-options (which are also checkboxes). These fields are great for allowing the user to specify a single item of data — for example, whether they want to receive your newsletter or not, or to indicate that they have read your terms and conditions. Examples might be simplified to improve reading and basic understanding. W3Schools is optimized for learning, testing, and training. If you'd like to contribute to the interactive examples project, please clone The compatibility table on this page is generated from structured data. Let the user select one or more options of a limited number of choices:The checkbox is shown as a square box that is ticked (checked) when activated.Checkboxes are used to let a user select one or more options of a limited number of choices.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: The tag specifies an input field where the user can enter data.