The Gadgets tab on Special:Preferences is badly formatted.
- Section headers are <h1> instead of <h2>
- There is absolutely no need to wrap it in the table at all, however, if by any chance there would be any need (which?), then don't output unnecessary <td class="mw-label"><label> </label></td>
at the beginning which causes ugly left padding of the entire content except for the header.
Feel free to split this to two bugs if necessary.