Manual merge of #988. Closes #988, fixes #987.

Author: Golmote

components/prism-core.js

@@ -484,7 +484,11 @@ if (script) {
 
 	if (document.addEventListener && !script.hasAttribute('data-manual')) {
 		if(document.readyState !== "loading") {
-			requestAnimationFrame(_.highlightAll, 0);
+			if (window.requestAnimationFrame) {
+				window.requestAnimationFrame(_.highlightAll);
+			} else {
+				window.setTimeout(_.highlightAll, 16);
+			}
 		}
 		else {
 			document.addEventListener('DOMContentLoaded', _.highlightAll);

components/prism-core.min.js

@@ -489,7 +489,11 @@ if (script) {
 
 	if (document.addEventListener && !script.hasAttribute('data-manual')) {
 		if(document.readyState !== "loading") {
-			requestAnimationFrame(_.highlightAll, 0);
+			if (window.requestAnimationFrame) {
+				window.requestAnimationFrame(_.highlightAll);
+			} else {
+				window.setTimeout(_.highlightAll, 16);
+			}
 		}
 		else {
 			document.addEventListener('DOMContentLoaded', _.highlightAll);