/**
 * Modifies tag cloud widget arguments to display all tags in the same font size
 * and use list format for better accessibility.
 *
 * @param 	array $args Arguments for tag cloud widget.
 * @return 	array The filtered arguments for tag cloud widget.
 */
function prefix_widget_tag_cloud_args( $args ) {
	$args['largest']  = 1;
	$args['smallest'] = 1;
	$args['unit']     = 'em';
	$args['format']   = 'list';

	return $args;
}

add_filter( 'widget_tag_cloud_args',    'prefix_widget_tag_cloud_args' 		10, 1 );