Allow CodePen attributes in <p> tags

functions.php

<?php
function add_allowed_tags($tags, $context) {

	if ($context === 'post') {

		$tags['p'] = array(
			'data-height'        => true,
			'data-theme-id'      => true,
			'data-slug-hash'     => true,
			'data-default-tab'   => true,
			'data-user'          => true,
			'data-embed-version' => true,
			'data-pen-title'     => true,
		);

		return $tags;

	}

}

add_filter('wp_kses_allowed_html', 'add_allowed_tags');
?>