This visualization shows the relationship between registration time and validity time for sequential data versions, displayed as stacked colored rectangles on an SVG canvas. Each version is represented by a distinct color (bisque, peach, coral, and orange), with rectangles positioned to indicate when each version was registered along the x-axis and its validity period along the y-axis. The chart includes labeled axes for both time dimensions, a legend explaining the color-to-version mapping, and axis markers indicating "now" on both timelines. The implementation uses raw SVG elements—including `rect`, `line`, and `text`—styled with inline CSS classes.