From Fedora Project Wiki

Testing message boxes

Note

{{ Template:message/note |  This is a Note 
}}
Note.png
This is a Note

Notice

{{ Template:message/notice |  This is a notice 
}}
Idea.png
This is a notice

Warnings

{{ Template:message/warning |  This is a warning 
}}
Important.png
This is a warning
{{ Template:message/warning2 |  This is another warning
}}
Stop (medium size).png
This is another warning
{{ Template:message/warning3 |  This is very serious WARNING 
}}

{{ Template:message/warning3 | This is very serious WARNING