<!DOCTYPE html>
<script src="resources/srcset-helper.js"></script>
<style>
    ul {
        list-style-image: -webkit-image-set(url('resources/deleteButton.png') 1x, url('resources/deleteButton-2x.png') 2x);
        list-style-position: inside;
        padding: 0;
        margin: 0;
    }
</style>
<ul><li></ul>