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// wrapped in "mw.loader.using" so this doesn't execute until Tablesorter has loaded
mw.loader.using( 'jquery.tablesorter', function() {
// if( isSortedTablePage() ) $('table.sortable').tablesorter( {sortList: [ { 0: 'desc'} ]} )
// or look for tables with an ID attribute of "sortMe" on any page
$( '#sortMe' ).tablesorter( {sortList: [ { 0: 'desc'} ]} )
} );
} );