Unroll the ( || ) in the math - Fixes #12497 - Thanks @lukemella @curiousdannii - Closes gh-1019

src/effects.js

@@ -81,7 +81,9 @@ function Animation( elem, properties, options ) {
 		tick = function() {
 			var currentTime = fxNow || createFxNow(),
 				remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),
-				percent = 1 - ( remaining / animation.duration || 0 ),
+				// archaic crash bug won't allow us to use 1 - ( 0.5 || 0 ) (#12497)
+				temp = remaining / animation.duration || 0,
+				percent = 1 - temp,
 				index = 0,
 				length = animation.tweens.length;