$this->outputHeader();
$this->getOutput()->allowClickjacking();
$this->getOutput()->addHTML(
- Html::openElement( 'table', [ 'class' => 'mw-datatable',
+ Html::openElement( 'table', [ 'class' => 'mw-datatable sortable',
'id' => 'mw-trackingcategories-table' ] ) . "\n" .
"<thead><tr>
<th>" .