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                <!DOCTYPE html>
<!-- Design by -->
<html lang="en">
  <meta charset="UTF-8">
  <title>Pure javascript image zoom </title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <style media="screen">
    figure.zoom {
  background-position: 50% 50%;
  position: relative;
  margin: 150px auto;
  border: 5px solid white;
  box-shadow: -1px 5px 15px black;
  height: 300px;
  width: 500px;
  overflow: hidden;
  cursor: zoom-in;
figure.zoom img:hover {
  opacity: 0;
figure.zoom img {
  transition: opacity 0.5s;
  display: block;
  width: 100%;
  <figure class="zoom" onmousemove="zoom(event)" style="background-image: url(">
  <img src="" />
<script type="text/javascript">
function zoom(e){
  var zoomer = e.currentTarget;
  e.offsetX ? offsetX = e.offsetX : offsetX = e.touches[0].pageX
  e.offsetY ? offsetY = e.offsetY : offsetX = e.touches[0].pageX
  x = offsetX/zoomer.offsetWidth*100
  y = offsetY/zoomer.offsetHeight*100 = x + '% ' + y + '%';