X-Git-Url: http://source.bookstackapp.com/bookstack/blobdiff_plain/553d3ce861c733ff6a90956ef71f116028f3f49b..refs/pull/1462/head:/resources/assets/js/components/page-display.js

diff --git a/resources/assets/js/components/page-display.js b/resources/assets/js/components/page-display.js
index 1aeeaf248..e87966d7d 100644
--- a/resources/assets/js/components/page-display.js
+++ b/resources/assets/js/components/page-display.js
@@ -184,9 +184,9 @@ class PageDisplay {
 
     setupNavHighlighting() {
         // Check if support is present for IntersectionObserver
-        if (!'IntersectionObserver' in window ||
-            !'IntersectionObserverEntry' in window ||
-            !'intersectionRatio' in window.IntersectionObserverEntry.prototype) {
+        if (!('IntersectionObserver' in window) ||
+            !('IntersectionObserverEntry' in window) ||
+            !('intersectionRatio' in window.IntersectionObserverEntry.prototype)) {
             return;
         }