Quadrant: Labels Without Points
With no points the quadrant labels are centred in their cells and the x axis stays on top of the plot, as in Mermaid.
quadrant-labels-without-points.mmd
quadrantChart
title Eisenhower matrix
x-axis Urgent --> Not urgent
y-axis Not important --> Important
quadrant-1 Do first
quadrant-2 Schedule
quadrant-3 Delegate
quadrant-4 Eliminate