I am pretty new to this, or several years removed being more like it. I replaced toggle with contains. How else would I change this. Thanks!
<script>
var coll = document.getElementsByClassName("collapsible");
var i;
for (i = 0; i < coll.length; i++) {
coll.addEventListener("click", function() { this.classList.contains("active"); var content = this.nextElementSibling; if (content.style.display === "block") { content.style.display = "none"; } else { content.style.display = "block"; } }); } </script>