class and id

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Last edited Jun 22, 2018

Created on Jun 22, 2018

Two tiny circles demonstrate D3’s selection behavior with the `class` and `id` attributes. The SVG shows one red and one blue circle, each drawn from a hardcoded data array of coordinates. The code uses `d3.select` and `d3.append` with `selectAll('g')` and `selectAll('circle')`, assigning a fixed `class` and `id` to every circle, though only one shape appears visually. The example highlights how D3 groups and styling via `attr('fill')` work, but does not use any data-driven differentiation beyond the two constant color values.

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