Add a blank tracker DIV to the end of an article in Genesis. For use with the Progress Bar tutorial on calvinkoepke.com

functions.php

<?php
//* Do NOT include the opening PHP tag

//* Add end of content tracker
add_action( 'genesis_after_entry_content', 'ck_content_tracker' );
function ck_content_tracker() {
  echo '<div id="end-of-content"></div>';
}