Alter allowed tags

gce-alter-allowed-tags.php

<?php
/*
Plugin name: Alter allowed tags
*/

function gce_alter_allowed_tags() {
  global $allowedposttags;

	$allowedposttags['a']['data-toggle'] = true;
	$allowedposttags['a']['data-target'] = true;

	//$allowedposttags['a']['something-else'] = true;
}

add_action( 'plugins_loaded', 'gce_alter_allowed_tags' );