updated

🆙

An  updated  is a post that has been edited by the author. It should have  with the datetime of the update for machines. For people it may have either text and optionally some other visual indicator to show which parts of the post were changed.

HTML has tags including and  for assisting in  helping to mark up changes. Many CMS platforms include some basic CSS mark up for making these changes visually obvious. This paragraph is an example of how they display in MediaWiki with a strikethrough for  and an underline for.

Why
There are numerous reasons you may want to update a post, and indicate to others that you want any copies updated, hoping they will update any caches of it, from displays of your responses to reply-contexts in reply to your original posts.

Use Case
A user updates a post and wants any copies of that post (i.e. if it was a reply post) on other sites to also be updated.

Handling
How to handle updated posts, i.e. implementation details:


 * When a post is updated by the user, implementations should:
 * send a webmention to all URLs that were either in the previous version of the post or the new version
 * update any POSSE copies of that post. See POSSE Update for details.


 * When the permalink of a post that has been updated is requested, implementations should return:
 * an HTML h-entry with a  with the date the post was updated.

IndieWeb Examples
Not sure who explicitly supports proper "updated" posts with dt-updated and automatic sending of webmentions to all URLs whether in the previous or new version of a post.

If you think you support updated posts properly, try http://webmention.rocks/ Update tests, if you pass them all, add yourself here with citations of your updated post(s).

bear
has implemented updated posts support on his site bear.im since 2016-04-15.

Example URL of an updated post:
 * https://bear.im/bearlog/2016/106/testing-webmention-rocks-updates.html

Eddie Hinkle
has implemented updated posts support on his site since 2018-11-03.
 * Example: IndieWeb Project Page

gRegor Morrill
has implemented updated posts support on his site since 2014-07-11.
 * Example: https://gregorlove.com/2014/07/just-a-heads-up-we/

Chris Aldrich
has used the  microformat on his updated posts since around 2015. Except for small spelling or grammar errors, he marks up larger changes in HTML with the  tag which includes some CSS to highlight all or portions of the changed text as necessary for readers.
 * Code example:
 * Note: The WordPress Classic editor has an interface button that will automatically add something like, but with the appropriate date and time the button was pressed, and then the closing tag to make this process easier.
 * Example: https://boffosocko.com/2012/06/17/big-history/#Added%20material has two insertion tags to indicate that the material below them was added on subsequent updates.
 * WordPress provides a custom query string that can be added onto URLs to provide a view of recent updates
 * Example: https://boffosocko.com/?orderby=modified
 * Example of a feed for updates https://boffosocko.com/feed/?orderby=modified

Media Examples
Major media sites update their articles from time to time, e.g.

New York Times
The New York Times updated this article published 2017-03-24 within minutes of publication, with a revised article name and content edits:



Facebook
Facebook supports editing posts and shows that a post has been "edited". (See versioning for details).

Flickr
Flickr supports replacing the photo of a photo post, without changing its permalink, comments etc.

Update POSSE copies
When you update a post, you should update its POSSE copies too if you can.

Notifying Responses

 * send a webmention to all responses to the post (so the responses can update their reply-context, per reply-context CRUD, possibly notify the responder so they can update or delete their response).
 * Note: this is subject to the issues documented re: reply-context CRUD

Threaded Comments Problems
Similar to deleted posts, but perhaps less disruptive, and updated post or comment may impact the relevance / meaning of subsequent replies.