Editable Row, Row Span, Column, and Column Span fields in the web control inspector

In the web page designer, the inspector shows a control's grid placement — Row, Row Span, Column, and Column Span — as read-only labels. It should be possible to adjust these four placement values directly in the inspector instead of only through dragging, so precise layouts can be entered numerically.

Typed values need to be clamped intelligently so an entry can never produce an invalid or broken layout: rows and columns stay non-negative, spans stay at least 1, and a control can never extend past the right edge of the current breakpoint's grid (4 columns on Compact, 8 on Medium, 12 on Wide). Row and Column should clamp against their spans, and vice versa. Placement edits should respect the same overlap handling used everywhere else in the designer and remain undoable like other model changes.