JSFiddle - React, Tailwind, and code Playground

HTML

<img id="the_image" src="http://placekitten.com/200/200" />

<div id="coords"></div>

JavaScript

$(function(){

$image = $('#the_image');
imgPos = [
    $image.offset().left,
    $image.offset().top,
    $image.offset().left + $image.outerWidth(),
    $image.offset().top + $image.outerHeight()
];

$image.mousemove(function(e){
  $('#coords').html((e.pageX-imgPos[0]) +', '+ (e.pageY-imgPos[1]));
});

});