Have you ever needed to post an important message to all editors about an article, on the article itself, but thought it would stick out like a sore thumb and ruin the article if you did? Are you reverting many edits on an article because editors just aren't seeing the important message or special instructions on the talk page?
The solution is that you can insert hidden text in the article! That way, only the people editing the page will see your message! Here is how to insert a hidden comment:
First, begin the comment by typing <!--
Once you have done that, type what you need the editors to read
Then, end the comment by typing -->
Once you have completed those 3 easy steps, you won't be reverting as many mistakes!
For example, the following hidden comment has been used in the Meaning of life article, in the Popular views section:
<!--Please do not add 42 in this section. It is covered under the section titled "Popular culture treatments". Thank you.-->
Some more examples of pages that have hidden messages include:
This is the tip of the day (a.k.a. TOTD) project, providing useful daily advice on how to use or develop Wikipedia more effectively. This project is responsible for maintaining the Wikipedia:Tip of the day#Tip templates, and the collection of daily tips that are displayed by those templates.