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-rw-r--r--app/javascript/mastodon/load_polyfills.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/app/javascript/mastodon/load_polyfills.js b/app/javascript/mastodon/load_polyfills.js
index df7889118..8927b7358 100644
--- a/app/javascript/mastodon/load_polyfills.js
+++ b/app/javascript/mastodon/load_polyfills.js
@@ -24,6 +24,8 @@ function loadPolyfills() {
   // This avoids shipping them all the polyfills.
   const needsExtraPolyfills = !(
     window.IntersectionObserver &&
+    window.IntersectionObserverEntry &&
+    'isIntersecting' in IntersectionObserverEntry.prototype &&
     window.requestIdleCallback &&
     'object-fit' in (new Image()).style
   );