diff --git a/13 - Slide in on Scroll/index-START.html b/13 - Slide in on Scroll/index-START.html
index 12591bad30..0b9fb8fccb 100644
--- a/13 - Slide in on Scroll/index-START.html	
+++ b/13 - Slide in on Scroll/index-START.html	
@@ -58,26 +58,6 @@ <h1>Slide in on Scroll</h1>
       };
     }
 
-    const sliderImages = document.querySelectorAll('.slide-in');
-
-    function checkSlide(e) {
-      sliderImages.forEach(sliderImage => {
-        // half way through the image
-        const slideInAt = (window.scrollY + window.innerHeight) - sliderImage.height / 2;
-        // bottom of the image
-        const imageBottom = sliderImage.offsetTop + sliderImage.height;
-        const isHalfShown = slideInAt > sliderImage.offsetTop;
-        const isNotScrolledPast = window.scrollY < imageBottom;
-        if (isHalfShown && isNotScrolledPast) {
-          sliderImage.classList.add('active');
-        } else {
-          sliderImage.classList.remove('active');
-        }
-      });
-    }
-
-    window.addEventListener('scroll', debounce(checkSlide));
-
   </script>
 
   <style>