I have this pdf report that contains a very complex DOM Tree, so to collect my certain divs and apply my style I decided to use javascript like this:

<script type="text/javascript">
    function set_style() {
        var tickets = document.getElementByClass('ticket');
        for (ticket in tickets){
            if (tickets.indexOf(ticket) in [2, 4, 6]) {
                ticket.style.padding-left='15px!important;';
            }
       }
    }}
</script>

When I generate my pdf report nothing has changed.

Anyone has an idea? Thank you.