Target marker

While you move or resize a block, the editor displays a target marker: a purple frame that materializes the area where the block will land once snapped to the grid.

What the target marker is for

The canvas snaps to a grid (in columns and rows), even when your mouse moves continuously. The target marker shows you the area actually taken by the block once the value is rounded to the grid — which avoids surprises when you release the mouse.

When you select several blocks, two frames appear: one frame per block, and a bounding frame for the entire group.

Grid size indicator

A floating black pill constantly shows the size of the target area in grid units, in the form row × col (for example 4 × 12 for four rows by twelve columns).

It's valuable information for reproducing consistent proportions: for example, if your cards are 8 × 6 on the first row, you'll know immediately when your new card reaches the same size.

When the marker appears

The target marker is only visible during an active movement. As soon as you release the mouse button, the block takes its final position and the frame disappears.