<button id="b" data-pos="static">TOGGLE position:absolute</button>

<div>
  <img src="http://placekitten.com/g/350/350" id="i">
</div>

<p>See <a href="http://www.sitepoint.com/12-little-known-css-facts/">article</a>.</p>

body {
  padding: 20px;
  font-family: Arial, sans-serif;
}

img {
  clip: rect(40px, 300px, 220px, 90px);
  position: static;
}

button {
  margin-bottom: 20px;
}

p {
  position: absolute;
  bottom: 0;
}

var a = document.getElementById('i'),
    b = document.getElementById('b');

b.addEventListener('click', doToggle, false);

function doToggle () {
  if (b.getAttribute('data-pos') === 'absolute') {
    a.style.position = 'static';
    b.setAttribute('data-pos', 'static');
  } else {
    a.style.position = 'absolute';
    b.setAttribute('data-pos', 'absolute');
  }
}