The tr HTML element is used to define a row in a table. It acts as a container for table cells, which can be either header cells () or data cells (). Each tr element represents a single row within the table structure, organizing the content horizontally.

The title HTML element is used to define the title of an HTML document. This title is displayed on the browser's title bar or tab and is used by search engines to identify the content of the page. It is crucial for SEO and provides context to users about the webpage's content.

The time HTML element is used to represent a specific period in time, such as a date, time, or both. It can include a datetime attribute to provide a machine-readable format, enhancing the semantic meaning of the content and improving accessibility and search engine optimization.

The thead HTML element is used to define the header section of a table, containing rows of header information that describe the columns of the table. It is typically used alongside tbody and tfoot elements to provide a clear and semantic structure to a table, enhancing both readability and accessibility.

The th HTML element is used to define a header cell in a table. It is typically used within a table row () and is intended to label columns or rows, providing context for the data contained in the corresponding data cells (). Header cells are often rendered with bold text and centered alignment by default.

The tfoot HTML element is used to define the footer section of a table, containing rows of summary or aggregate data. It is typically used in conjunction with the thead and tbody elements to semantically structure a table, providing valuable contextual information for both visual presentation and assistive technologies.