Ignore keyframe selectors outside [0-100%] (bug 14795)

Author: Sylvain Galineau

css3-animations/Overview.src.html

@@ -248,7 +248,11 @@ <h2 id="keyframes">
 		using the computed values of the properties being animated. 
 		If a ''100%'' or ''to'' keyframe is not specified, 
 		then the user agent constructs a ''100%'' keyframe 
-		using the computed values of the properties being animated.
+		using the computed values of the properties being animated. 
+		If a keyframe selector specifies 
+		negative percentage values or
+		values higher than 100%,
+		then the keyframe will be ignored.
 
 	<p>
 		The <dfn>keyframe declaration block</dfn> for a keyframe rule