Add HTML before a specific div?

Seems like jQuery is best for this case. Mainly answering for myself in case I’ll need it again in the future:

<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("#this_comes_before").insertBefore("#wc_checkout_add_ons");
});
</script>
</head>
<body>

<div id="wc_checkout_add_ons">stuff</div>

<div id="this_comes_before">something</div>

</body>

Edit for future me:

Use this instead you lazy asshole… 

add_action( 'woocommerce_checkout_after_customer_details', 'test99' );
function test99() {
echo "your shit";
}

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