diff --git a/src/js/index.js b/src/js/index.js
index 71df099..b67add8 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -1,8 +1,6 @@
 (function() {
 	window.addEventListener('DOMContentLoaded', event => {
-		if (!!window.IntersectionObserver) {
-			document.body.classList.add('supports-intersect');
-		}
+		const intersectionSupport = !!window.IntersectionObserver;
 
 		function onScreenHandler(entries) {
 			entries.forEach(entry => {
@@ -15,12 +13,15 @@
 		}
 
 		document.querySelectorAll('.js-onscreen').forEach(el => {
-			const options = {
-				rootMargin: '0px',
-				threshold: [0, 1],
-			};
-			const observer = new IntersectionObserver(onScreenHandler, options);
-			observer.observe(el);
+			if (intersectionSupport) {
+				const options = {
+					rootMargin: '0px',
+					threshold: [0, 1],
+				};
+				const observer = new IntersectionObserver(onScreenHandler, options);
+				observer.observe(el);
+				el.classList.add('is-observed');
+			}
 		});
 	});
 })();