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Last edited Apr 16, 2018

Created on Apr 16, 2018

A black vertical rule tracks the mouse horizontally across an empty SVG canvas. The visualization relies on D3 v4 event handling: a transparent rectangle captures mouseover and mousemove events, updating the path element’s `d` attribute to draw a line from the top to the bottom of the plotting area. The mouse-out event fades the line to opacity zero. The code uses `d3.select`, `d3.mouse`, and style manipulation, though no data is displayed—only the interactive guideline.

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