kenwheeler/cash – уменьшенная альтернатива jQuery для современных браузеров

Minified & Gzipped – 5 KB, на 85% меньше jQuery

<script src="https://cdnjs.cloudflare.com/ajax/libs/cash/4.1.1/cash.min.js"></script>
<script>
  $(function () {
    $('html').addClass ( 'dom-loaded' );
    $('<footer>Appended with Cash</footer>').appendTo ( document.body );
  });
</script>

https://github.com/kenwheeler/cash