Try it yourself
Pick an existing Post (or write your own Snippet) and add it to a side column on the Test page. If you have trouble locating the Custom Field panel, you may need to turn it on in the Screen Options area below the Admin Bar.
- Set the Custom Fields Name to
right-0-post
. - Type
ids =
and the ID of your post into the Custom Fields Value field. - Click Add Custom Field
- Update the page.