Column Width Diagnostics

This table's two fixed-width columns (200px + 200px = 400px) already consume the entire 360px content width on their own, leaving the third, auto-width column nothing - it resolves to 0px and its content isn't visible.

Fixed AFixed BAuto (collapses to 0px)
ABNot
(continued)
Fixed AFixed BAuto (collapses to 0px)
visible