MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
function efAddSkinStyles(OutputPage &$out, Skin &$skin) {
    if(!$skin->getUser()->isLoggedIn()) {
        if ($skin->getSkinName() == 'vector') {
            $out->addInlineStyle('#ca-history { display:none; }');
        }
    } else {
        if ($skin->getSkinName() == 'vector') {
            $out->addInlineStyle('#ca-view { display:none; }');
        }
    }

    return true;
}
$wgHooks['BeforePageDisplay'][] = 'efAddSkinStyles';