SO-34050904

by David Thomas

HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<img src="whatever.jpg" />
<span>Copyright Stackoverflow</span>

CSS

span {
  color: limegreen;
}

figcaption {
  color: #f90;
}

JavaScript

$('img + span').replaceWith(function () {
  return '<figcaption>' + this.textContent + '</figcaption>'
});