diff --git a/_includes/extensions/hashlocate.html b/_includes/extensions/hashlocate.html
index 5194273..fd4a3d6 100644
--- a/_includes/extensions/hashlocate.html
+++ b/_includes/extensions/hashlocate.html
@@ -36,7 +36,7 @@
 
   // The first event occurred
   window.addEventListener('click', function(event) {
-    if (event.target.matches('a')) {
+    if (event.target.tagName.toLowerCase() == 'a') {
       hashLocate(event.target.getAttribute('href'));
     }
   });
diff --git a/_includes/sidebar/article-menu.html b/_includes/sidebar/article-menu.html
index 2e273de..3e618ff 100644
--- a/_includes/sidebar/article-menu.html
+++ b/_includes/sidebar/article-menu.html
@@ -36,9 +36,13 @@
     // The header element
     var header = document.querySelector('header.site-header');
 
-    function doMenuCollapse(index, over_items=20) {
+    function doMenuCollapse(index, over_items) {
       var items = menuContent.firstChild.children;
 
+      if (over_items == undefined) {
+        over_items = 20;
+      }
+
       if (items.length < over_items) {
         return;
       }
diff --git a/assets/js/main.js b/assets/js/main.js
index 01c0ca5..ff3f2a3 100644
--- a/assets/js/main.js
+++ b/assets/js/main.js
@@ -58,10 +58,12 @@ function smoothScrollTo(y, time) {
 
 // Init highlight js
 document.addEventListener('DOMContentLoaded', function(event) {
-  document.querySelectorAll('pre code').forEach((block) => {
+  var els = document.querySelectorAll('pre code')
+  function handle(block) {
     var outer = block.parentElement.parentElement.parentElement;
     var lang = block.getAttribute('data-lang');
-    for (var cls of outer.classList) {
+    for (var i = 0; i < outer.classList.length; i++) {
+      var cls = outer.classList[i];
       if (cls.startsWith('language-')) {
         lang = cls;
         break;
@@ -77,5 +79,9 @@ document.addEventListener('DOMContentLoaded', function(event) {
     block.setAttribute('class', 'hljs ' + lang);
     block.parentNode.setAttribute('data-lang', lang);
     hljs.highlightBlock(block);
-  });
+  }
+  for (var i = 0; i < els.length; i++) {
+    var el = els[i];
+    handle(el);
+  }
 });