1 d3.svg.mouse = function(container) {

     2   return d3_svg_mousePoint(container, d3.event);

     3 };

     4 

     5 // https://bugs.webkit.org/show_bug.cgi?id=44083

     6 var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;

     7 

     8 function d3_svg_mousePoint(container, e) {

     9   var point = (container.ownerSVGElement || container).createSVGPoint();

    10   if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {

    11     var svg = d3.select(document.body)

    12       .append("svg:svg")

    13         .style("position", "absolute")

    14         .style("top", 0)

    15         .style("left", 0);

    16     var ctm = svg[0][0].getScreenCTM();

    17     d3_mouse_bug44083 = !(ctm.f || ctm.e);

    18     svg.remove();

    19   }

    20   if (d3_mouse_bug44083) {

    21     point.x = e.pageX;

    22     point.y = e.pageY;

    23   } else {

    24     point.x = e.clientX;

    25     point.y = e.clientY;

    26   }

    27   point = point.matrixTransform(container.getScreenCTM().inverse());

    28   return [point.x, point.y];

    29 };