The sup HTML element is used to display text as superscript, positioning it slightly above the baseline of the surrounding text. This is commonly used in mathematical expressions, footnotes, and other contexts where superscript notation is necessary.

The summary HTML element is used as a summary or heading for a details element, providing a clickable label that controls the visibility of the content within the details. It serves as a brief description or title for the expandable content, enhancing user interaction and accessibility.

The sub HTML element is used to display text as subscript, positioning it slightly below the baseline of the surrounding text. This is commonly used in mathematical formulas, chemical equations, and other contexts where subscript notation is required.

The style HTML element is used to embed CSS (Cascading Style Sheets) directly within an HTML document. It allows for the definition of styles that apply to the document, controlling the presentation of HTML elements such as layout, colors, and fonts.

The strong HTML element is used to indicate that text is of strong importance, typically rendered in bold by browsers. It semantically emphasizes content, suggesting that the enclosed text has a greater degree of importance compared to surrounding text.

The span HTML element is a generic inline container used to group text or other inline elements for styling purposes with CSS or for manipulation with JavaScript. It does not inherently represent anything semantically but is useful for applying styles or scripts to a specific part of the text.