JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://i.stack.imgur.com/64hub.png" />

JavaScript

var tooltip = $( '<div id="tooltip">' ).appendTo( 'body' )[0];

$( 'img' ).
    each(function () {
        var pos = $( this ).position(),
            top = pos.top,
            left = pos.left,
            width = $( this ).width(),
            height = $( this ).height(); 
        $( this ).
            mousemove(function ( e ) {
                var x = e.pageX - left,
                    y = e.pageY - top;

                $( tooltip ).html( 'x = ' + x + '<br/>y = ' + y ).css({
                    left: e.clientX + 10,
                    top: e.clientY + 10
                }).show();
            }).
            mouseleave(function () {
                $( tooltip ).hide();
            }); 

    });