Debug mode

Debug mode overlays the grid and scroll geometry on a deck, which is invaluable while authoring — it makes coordinates and snap positions visible instead of guessed at.

Toggling it

Press d to toggle debug mode in either view. A D indicator in the bottom-right shows when it's active.

What it shows

In the deck map:

• slide-grid boundary lines, and
• each cell's (col, row) coordinate in a label.

In slide view:

• grid lines at 10% intervals of the scroll range,
• the numerical value of each snap position, and
• a live scroll-position readout on the scrollbar thumb.

Together these let you line up element positions, confirm snap placements, and read off the exact scroll values to use in animation keyframes.