Add `unfiltered_html` capability to editors on multisite.

add_unfiltered_html_to_editors.php

<?php
/**
 * Add `unfiltered_html` capability to editors (or other user roles).
 * On WordPress multisite, `unfiltered_html` is blocked for everyone but super admins. This gives that cap back to editors 
 * and above.
 *
 * @author Justin Tadlock
 * @link   http://themehybrid.com/board/topics/add-unfiltered_html-capability-to-editor-role#post-4629
 * @param  array  $caps    An array of capabilities.
 * @param  string $cap     The capability being requested.
 * @param  int    $user_id The current user's ID.
 */
function my_map_meta_cap( $caps, $cap, $user_id ) {

	if ( 'unfiltered_html' === $cap && user_can( $user_id, 'editor' ) )
		$caps = array( 'unfiltered_html' );

	return $caps;
}

add_filter( 'map_meta_cap', 'my_map_meta_cap', 1, 3 );

It worked for me, @jazzsequence. I tried various approaches and none of them have worked till I stop by your gist. Thank you so much for sharing.