From aaa7c02b5c7cc6a1697d90c786268cb72d0649be Mon Sep 17 00:00:00 2001
From: Jeroen Hermans <jeroen@datacamp.com>
Date: Sun, 15 Nov 2020 21:54:05 +0100
Subject: [PATCH] Prevent layout thrashing by status text

---
 js/reveal.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/js/reveal.js b/js/reveal.js
index 727cc8e..b3f81a1 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1335,7 +1335,11 @@ export default function( revealElement, options ) {
 		}
 
 		// Announce the current slide contents to screen readers
-		announceStatus( getStatusText( currentSlide ) );
+		// Use animation frame to prevent getComputedStyle in getStatusText
+		// from triggering layout mid-frame
+		requestAnimationFrame( function() {
+			announceStatus( getStatusText( currentSlide ) );
+		});
 
 		progress.update();
 		controls.update();