Wikipedia:Software notices
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There are a number of software notices to display message(s) to broad sets of Wikipedians.
Shows to users across multiple Wikimedia projects. Can be targeted by language, country, and other options. Dismissable and shows only to users with JavaScript support. Logged-in users can opt-out of certain types of banners in the Banners section of Special:Preferences. Controlled at meta:Special:CentralNotice. See also meta:CentralNotice.
Shows to all users; appears above the page title. Dismissable and shows only to users with JavaScript support. Controlled by MediaWiki:Sitenotice and MediaWiki:Sitenotice id.
Shows to all anonymous users; if blank, the sitenotice shows to anons as well. Appears above the page title. Controlled by MediaWiki:Anonnotice. Not dismissable.
Shows to all users who use a watchlist. Appears above the horizontal rule on the watchlist. Controlled by MediaWiki:Watchlist-messages. Dismissable using JavaScript found in MediaWiki:Gadget-watchlist-notice.js (can be enabled or disabled through the Gadgets section of your Preferences).
A watchlist notice that only displays to users in a certain geographical area, although geolocation is not perfect. Added and controlled by MediaWiki:Gadget-geonotice.js. See Wikipedia:Geonotice. Dismissable by JavaScript.
Shows to all users who are able to edit the page. Appears above the edit textarea. More information available at Wikipedia:Editnotices.