First D3 try

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Last edited Mar 16, 2020

Created on Mar 16, 2020

A single red circle is drawn at the center of a 960 by 500 pixel SVG canvas, with its radius set to half the canvas height. The example demonstrates a minimal first use of D3 v5 within a React framework, where the `d3.select` function targets the SVG element and `.attr` sets the circle’s radius, x-coordinate, and y-coordinate. The code uses the D3 `append` method to create the SVG circle, rendering directly to the SVG output.

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A bare minimum HTML page.

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