<section class="slide" id="<?php 
echo getSlideId(__FILE__);
?>
">
    <div>
        <?php 
echo code('php', '
// PHP
php > $foo = "10";
php > print $foo - 5;
5');
?>
    </div>
</section>

<?php

$slideId = getSlideId(__FILE__);
?>
<section class="slide" id="<?php 
echo $slideId;
?>
">
    <div>
        <div id="kitten"></div>
        <script>
            (function() {
                // Load the IFrame Player API code asynchronously.
                var tag = document.createElement('script');
                tag.src = "https://www.youtube.com/player_api";
                var firstScriptTag = document.getElementsByTagName('script')[0];
                firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

                var player;

                window.onYouTubePlayerAPIReady = function() {
                    player = new YT.Player('kitten', {
                        //height: '390',
                        width: '800',
                        videoId: 'Ofge6a3gGis',
                        events: {
//                            onReady: onPlayerReady
                        },
                        playerVars: {
                            controls: 0,
                            showinfo: 0,