Which headers label which cell

Three ways to mark up the same table, and the header cells the browser's algorithm assigns to every data cell.

Markup
Section enrolment by quarter (sample data)
Fall 2026 Winter 2027
Enrolled Waitlist Enrolled Waitlist
Lectures
A00212181984
B00187020511
Labs
A01586520
A02609552

Headers assigned to each data cell

Choose a cell in the table to highlight its headers.
    The markup of this version