diff --git a/src/platform_impl/web/web_sys/resize.rs b/src/platform_impl/web/web_sys/resize.rs
index 855b5c62775..b58c17a9539 100644
--- a/src/platform_impl/web/web_sys/resize.rs
+++ b/src/platform_impl/web/web_sys/resize.rs
@@ -50,24 +50,16 @@ impl ResizeHandle {
         canvas: &HtmlCanvasElement,
         entries: Array,
     ) -> SizeChangeArgs {
-        debug_assert_eq!(entries.length(), 1, "expected exactly one entry");
-        let entry = entries.get(0);
-        debug_assert!(entry.has_type::<ResizeObserverEntry>());
-        let entry: ResizeObserverEntry = entry.unchecked_into();
+        let entry: ResizeObserverEntry = entries.get(0).unchecked_into();
 
         let rect = entry.content_rect();
         let content = PhysicalSize::new(rect.width().round() as u32, rect.height().round() as u32);
 
         let pixel = has_device_pixel_support().then(|| {
-            let entries = entry.device_pixel_content_box_size();
-            debug_assert_eq!(
-                entries.length(),
-                1,
-                "a canvas can't be split into multiple fragments"
-            );
-            let entry = entries.get(0);
-            debug_assert!(entry.has_type::<ResizeObserverSize>());
-            let entry: ResizeObserverSize = entry.unchecked_into();
+            let entry: ResizeObserverSize = entry
+                .device_pixel_content_box_size()
+                .get(0)
+                .unchecked_into();
 
             let style = window
                 .get_computed_style(canvas)