D3.js: Position tooltips using element position, not mouse position?

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In your particular case you can simply use d to position the tooltip, i.e.

tooltip.html(d)  
  .style("left", d + "px")     
  .style("top", d + "px");

To make this a bit more general, you can select the element that is being moused over and get its coordinates to position the tooltip, i.e.

tooltip.html(d)  
  .style("left", d3.select(this).attr("cx") + "px")     
  .style("top", d3.select(this).attr("cy") + "px");

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