[css-variables-1][editorial] Updated Changes list

Author: tabatkins

css-variables-1/Overview.bs

@@ -785,7 +785,7 @@ Using Cascading Variables: the ''var()'' notation</h2>
 	<ol>
 		<li>
 			If the <a>custom property</a> named by the first argument to the ''var()'' function is <a>animation-tainted</a>,
-			and the ''var()'' function is being used in property that is [=not animatable=],
+			and the ''var()'' function is being used in a property that is [=not animatable=],
 			treat the <a>custom property</a> as having its initial value for the rest of this algorithm.
 
 		<li>
@@ -1249,6 +1249,27 @@ Changes Since the 03 December 2015 CR</h3>
 		made <<declaration-value>> optional in the custom property grammar,
 		so that empty variables are still allowed.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/774#issuecomment-434571254">Issue 774</a>)
+	* Similarly, made empty fallbacks valid in ''var()''.
+	* The '-' property is reserved for future use by CSS.
+	* Added concept of "animation-tainted",
+		to prevent non-animatable properties
+		from using a variable to smuggle in some animatability.
+	* Defined the [=guaranted-invalid value=]
+		to make the initial value of custom properties
+		and the result of cycles or substitution failure
+		more straightforward,
+		and allow failure to propagate thru substitutions
+		until finally intercepted by a fallback.
+	* Defined that cycles trigger [=invalid at computed-value time=] behavior.
+	* Allowed variables to resolve to a CSS-wide keyword
+		(only possible by providing it as a fallback).
+	* Clarified that [=registered custom properties=] act like non-custom properties
+		when they're [=invalid at computed-value time=].
+	* Made longhands with ''var()''s also trigger their shorthands to be unserializable,
+		like longhands with pending-substitution values already did.
+	* Required UAs to defend against exponential substitution attacks.
+	* Defined how to serialize the <em>values</em> of custom properties
+		(previously, only the property name's serialization was specified).
 
 <h3 id='changes-20140506'>
 Changes since the May 6 2014 Last Call Working Draft</h2>