Which tag is used specifically for text that provides context within a table structure?

The tag used specifically for text that provides context within a table structure is the TD tag. In HTML, the TD tag defines a cell in a table row, housing content such as text, images, or other data types. This tag is essential for organizing and displaying data in a tabular format, allowing for accessibility tools to interpret the structure and content correctly.

The use of the TD tag contributes to the semantic organization of the table, helping screen readers convey the information to users effectively. By enclosing context-specific data within TD tags, web developers ensure that the table is both visually understandable and meaningful semantically.

In contrast, the other options do not serve the same function within the context of a table. The SPAN tag is used for inline grouping of content without introducing a new block, making it more appropriate for styling or applying scripts to specific segments rather than conveying tabular structure. The DIV tag is a block-level container that groups content but lacks the specific association needed for table cells. Finally, the LI tag is designed for list items within ordered or unordered lists and is not applicable to table structures. Thus, TD is the correct choice for denoting text that provides context within a table.