Z-index For Svg Elements. The z-index style property is a much more convenient way to control Z index. In SVG the element order determines z-order.
The explanation is simple. Auto inherit Initial. Just post your question and most likely someone will answer it.
Elements in an SVG document fragment have an implicit drawing order with the first elements in the SVG document fragment getting painted first.
Then use D3 to bind your z-indices to that selection. Just post your question and most likely someone will answer it. The z-index property specifies the stack order of an element. As in which one appears as if it is physically closer to you.