Und so sieht der Code aus:

<iframe src="https://wp.uds-zell.de/wp-admin/admin-ajax.php?action=h5p_embed&id=1" width="958" height="174" frameborder="0" allowfullscreen="allowfullscreen" title="Versuch"></iframe><script src="https://wp.uds-zell.de/wp-content/plugins/h5p/h5p-php-library/js/h5p-resizer.js" charset="UTF-8"></script>