js read the URL parameters

edit test.html

<div id="test"></div>

<script>
  const p = new URLSearchParams(window.location.search);
  if (p.has('y')) {
    year = parseInt(p.get('y'), 10);
    document.getElementById("test").innerHTML = year;
  }
</script>

test.html?y=1000

result:
1000