How to remove an attribute in d3.js?

@domenico 

To remove an attribute in d3.js, you can use the .attr() method and pass null as the value for the attribute you want to remove.

Here's an example:

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d3.select("circle")
  .attr("fill", null);

In this example, we select a <circle> element using the d3.select() method. Then, we use the .attr() method to remove the fill attribute by passing null as the value.

Note: In some cases, setting an attribute to null might not remove it. In that case, you can use the .removeAttr() method:

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d3.select("circle")
  .removeAttr("fill");

This method directly removes the specified attribute from the selected element.