WordPress Tag Cloud args (font-size) not working since wp update 4.9

This solved the problem:

function my_custom_tag_cloud_widget( $args ) {
    $args['largest'] = 26;
    $args['smallest'] = 18;
    $args['format'] ='flat';
    $args['unit'] = 'px';
    $args['order'] = 'RAND';
    $args['separator'] = ' • ';
    return $args;
}

add_filter( 'widget_tag_cloud_args', 'my_custom_tag_cloud_widget', 999 );

Thanks for your interest. theo

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