JAVASCRIPT

svg clientx

var pt = svg.createSVGPoint();  // Created once for document

function alert_coords(evt) {
    pt.x = evt.clientX;
    pt.y = evt.clientY;

    // The cursor point, translated into svg coordinates
    var cursorpt =  pt.matrixTransform(svg.getScreenCTM().inverse());
    console.log("(" + cursorpt.x + ", " + cursorpt.y + ")");
}

svg clientx

function clicked(evt){
    var e = evt.target;
    var dim = e.getBoundingClientRect();
    var x = evt.clientX - dim.left;
    var y = evt.clientY - dim.top;
    alert("x: "+x+" y:"+y);
}