Form:Edit Source
This form is to be used by admin only (restricted=step) for pages that use a form where using the form will not remove certain artifacts. Since we have restricted pages that use a form to only be edited with form, this provides the functionality to correct pages that use a form that have, for example, stray }} marks at the end of the page because of some change in form code or whatever.
If your page has artifacts that cannot be removed using its form, ask an admin to fix it for you here.