MediaWiki:Common.css

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

mw.loader.using('jquery.makeCollapsible').then(function () {
    // Turn sidebar collapsibles into an accordion
    $('#mw-panel .mw-collapsible').on('beforeExpand.mw-collapsible', function () {
        // Collapse siblings when one expands
        $(this).siblings('.mw-collapsible').each(function () {
            if (!$(this).hasClass('mw-collapsed')) {
                $(this).find('.mw-collapsible-toggle').click();
            }
        });
    });
});

/* Style collapsible sidebar sections like dropdowns */
.mw-collapsible-toggle {
    float: right;
    font-weight: bold;
    cursor: pointer;
}

.mw-collapsible.mw-collapsed > .mw-collapsible-toggle::after {
    content: " ▼";  /* arrow when collapsed */
}

.mw-collapsible:not(.mw-collapsed) > .mw-collapsible-toggle::after {
    content: " ▲";  /* arrow when expanded */
}