page-image.php

<?php require_once($_SERVER['DOCUMENT_ROOT'] . '/header.php'); ?>

<section class="panel panel--3">

  <span>
    Transition fail. Normally.
  </span>

  <img class="lazyload" data-src="/dog.jpeg" alt="">

</section>

<?php require_once($_SERVER['DOCUMENT_ROOT'] . '/footer.php'); ?>