Here is how Real Obvious Info works... Page Viewer - Info messages are displayed embedded in wiki pages to the viewer. Page Editor - An Info message is added to a page using standard MediaWiki Templates "{{Info|...}}" Wiki Admin - Real Obvious Info is installed by updating common.css,  uploading an image, and creating the Info [...]

Nothing. Real Obvious Info is provided free of charge.

Compatibility, Simplicity, and Cost. Compatibility - To ensure the widest possible compatibility across MediaWiki servers, Real Obvious Info is installed as an enhancement (not a plugin). Installing Real Obvious Info is easy as 1-2-3 -- Step 1) Upload the info image; Step 2) Update common.css; Step 3) Create the MediaWiki Info Template. Simplicity - MediaWiki [...]

Real Obvious Info is a MediaWiki Enhancement designed to be installed and used on MediaWiki websites connected to the Internet or operated within isolated enclaves / dark sites.