Need help enabiling html_errors

Hey,

 I have set html_errors  to "On" my php.ini settings. But  when I create 3 custom error messages, they don't render as HTML. Just plain text.

Any suggestions on how i can solve this?

Below is my code and how it out puts on the browser.

Any help would be really appreciated!

   <?php trigger_error('Custom Notice', E_USER_NOTICE);
      trigger_error('Custom Warning', E_USER_WARNING);
      trigger_error('Custom error', E_USER_ERROR); 

?>