The li HTML element is used to represent an individual item within a list, whether ordered (ol) or unordered (ul), contributing to the structured presentation of grouped content.

The legend HTML element is used to provide a caption or title for a fieldset, enhancing the organization and accessibility of grouped form controls.

The label HTML element is used to define a label for an input element in a form, enhancing accessibility by improving navigation and interaction for users, especially those using assistive technologies.

The keygen HTML element was used to generate a key pair for cryptographic purposes within a form, facilitating secure user authentication. However, it is now obsolete and not supported in modern browsers.

The kbd HTML element is used to represent user input via a keyboard, typically rendered in a monospace font to distinguish it from other text.

The ins HTML element is used to represent text that has been inserted into a document, often displayed with an underline to indicate the addition.