MediaWiki:Common.css

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• Internet Explorer / Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5
• Opera: Go to Menu → Settings (Opera → Preferences on a Mac) and then to Privacy & security → Clear browsing data → Cached images and files.

/* CSS placed here will be applied to all skins */

/* div#mw-fr-revisiontag {display: none} */

<!-- No [view source] tab for anonymous users -->
<?php global $wgUser; if( $wgUser->isAnon() ) { ?>
        div#mw-fr-revisiontag {display: none}
    <?php } ?>