1 files changed, 1 insertions, 1 deletions
diff --git a/src/static/js/client/sticky-heading.js b/src/static/js/client/sticky-heading.js
index 4660013a..1318ca0b 100644
--- a/src/static/js/client/sticky-heading.js
+++ b/src/static/js/client/sticky-heading.js
@@ -255,7 +255,7 @@ function getContentHeadingClosestToStickySubheading(index) {
 
   // Iterate from bottom to top of the content area.
   const contentHeadings = info.contentHeadings[index];
-  for (const heading of contentHeadings.slice().reverse()) {
+  for (const heading of contentHeadings.toReversed()) {
     if (heading.nodeName === 'SUMMARY' && !heading.closest('details').open) {
       continue;
     }