Can't use span/html in navigation label

Hi,

I want to add html to my navigation label.
If I write f.eks < span style=”font-weight:bold;” >about< /span > US it’s shown like that in frontend.

Why can’t I use html/span in navigation label?

I’m also looking for a way to display the description before the title and not after.

The code is:
if ( $args->description )
$output .= sprintf(‘ <span class=”nav_desc” style=”color:#fff;”>%s</span>’, esc_html($item->description));
}