// orig source: https://guwii.com/bytes/sass-function-loop-headings-h1h2h3h4h5h6/

@function headings($from:1, $to:6) {
    @if $from == $to {
        @return 'h#{$from}';
    } @else {
        @return 'h#{$from},' + headings($from+1, $to);
    }
}