Mouse position in D3

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You have to use an array. That will store x and y like: 

var coordinates= d3.mouse(this);
var x = coordinates[0];
var y = coordinates[1];

// D3 v4
var x = d3.event.pageX - document.getElementById(<id-of-your-svg>).getBoundingClientRect().x + 10
var y = d3.event.pageY - document.getElementById(<id-of-your-svg>).getBoundingClientRect().y + 10

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