> For the complete documentation index, see [llms.txt](https://lados-organization.gitbook.io/goku/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lados-organization.gitbook.io/goku/chapter-12-the-checkbox-element.md).

# Chapter 12: The Checkbox Element

The `Checkbox` struct represents a checkbox UI element. It is composed of a `Button` and a `checked` flag. The `render` method draws the checkbox and, if it is checked, adds a checkmark inside the box. The `toggle` method changes the state of the checkbox and triggers the associated callback function.