Real code I just found in our codebase

RaceProUK

    <script type="text/javascript">
        jQuery(window).on('load', function () {});
        function do_nothing() { return; }
    </script>

The same file also had this three times:

<meta http-equiv="content-type" content="text/html; charset=utf-8" />

Onyx

No

<body onload="javascript:void()">

???

LAAAAMEEEE!

loopback0

The same file also had this three times:

Someone wanted to be really sure?

PleegWat

@RaceProUK That is either completely pointless, or a very subtle hack they really should have added a comment to.

RaceProUK

@PleegWat Either way, the person responsible is due an appointment with my Clue Hammer.

A Google Image Search for 'Clue Hammer' gets a lot of cats.

Jaloopa

A Google Image Search for 'Clue Hammer' gets a lot of cats.

Apparently all from cluehammer.com, which looks like a personal website full of pictures someone's taken of their cat