[css-values-5] Mark as diff spec

Author: fantasai

css-values-5/Overview.bs

@@ -4,7 +4,7 @@ Group: CSSWG
 Shortname: css-values
 Level: 5
 Status: ED
-Work Status: Refining
+Work Status: Exploring
 ED: https://drafts.csswg.org/css-values-5/
 TR: https://www.w3.org/TR/css-values-5/
 Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
@@ -31,18 +31,12 @@ td > small { display: block; }
 <h2 id="intro">
 Introduction</h2>
 
-	The value definition field of each CSS property can contain keywords,
-	data types (which appear between <css>&lt;</css> and <css>></css>),
-	and information on how they can be combined.
-	Generic data types (<<length>> being the most widely used)
-	that can be used by many properties are described in this specification,
-	while more specific data types (e.g., <<spacing-limit>>)
-	are described in the corresponding modules.
+	ISSUE: <strong>This is a diff spec against <a href="https://www.w3.org/TR/css-values-4/">CSS Values and Units Level 4</a>.</strong>
 
 <h3 id="placement">
 Module Interactions</h3>
 
-	This module supersedes [[CSS-VALUES-4]]
+	This module extends [[CSS-VALUES-4]]
 	which replaces and extends the data type definitions in [[!CSS21]] sections
 	<a href="https://www.w3.org/TR/CSS21/about.html#value-defs">1.4.2.1</a>,
 	<a href="https://www.w3.org/TR/CSS21/syndata.html#values">4.3</a>,
@@ -144,7 +138,7 @@ Toggling Between Values: ''toggle()''</h3>
 	so the declarations ''background-position: top center'' and ''background-position: 50% 0%''
 	produce identical computed values.
 	If the "Computed Value" line of a property definition seems to define something ambiguous or overly strict,
-	please <a href="#status">provide feedback</a> so we can fix it.
+	please <a href="#sotd">provide feedback</a> so we can fix it.
 
 	If ''toggle()'' is used on a <a>shorthand property</a>,
 	it sets each of its longhands to a ''toggle()'' value