[css-color-4] update list of changes

Author: svgeesus

css-color-4/Overview.bs

@@ -4902,6 +4902,25 @@ Changes</h2>
 </h3>
 
 <ul>
+	<!-- to 20 May 2021 -->
+	<li>Added components descriptor to @color-profile, for use in CSS Color 5</li>
+	<li>All predefined RGB colorspaces are defined over the extended range</li>
+	<li>Clarified that there is no gamut mapping or gamut clipping step prior to color interpolation</li>
+	<li>Clarified interpolation of legacy sRGB syntaxes</li>
+	<li>Removed the lab option from ''color()''</li>
+	<li>List steps to interconvert between predefined color spaces</li>
+	<li>Consistent use of the term color space (two words)</li>
+	<li>Provided more guidance on selecting color space for mixing </li>
+	<li>Recalculated an example to increase precision</li>
+	<li>Added hue interpolation example</li>
+	<li>Simplified ''color()'' syntax by removing the fallback options</li>
+	<li>Clarified the types of ICC profile that may be linked from @color-profile</li>
+	<li>Support for the rare ICC Named Colors was removed</li>
+	<li>Improved precsion of standard whitepoint chromaticities</li>
+	<li>Removed a trademark from description of one predefined color space</li>
+	<li>Rephrased interpolation to be more generic wrt to interpolation space</li>
+	<li>Corrected Accessibility Considerations section</li>
+	<li>Clarified that the color space argument for ''color()'' is mandatory, even for sRGB</li>
 	<li>Clarified that currentColor is not restricted to sRGB</li>
 	<!-- to 3 Feb 2021 -->
 	<li>Small correction to the sRGB to XYZ to sRGB matrices, improve round-tripping</li>
@@ -5073,44 +5092,52 @@ Changes</h2>
 <h3 id='changes-from-3'>
 Changes from Colors 3</h3>
 
-	<ol>
-		<li>''rgb()'' and ''rgba()'' functions now accept <<number>> rather than <<integer>>.
+	The primary change, compared to SS Color 3,
+	is that CSS colors are no longer restricted to the
+	narrow gamut of sRGB.
 
-		<li>''hsl()'' and ''hsla()'' functions now accept <<angle>> as well as <<number>> for hues.
+	To support this, several brand new features have been added:
 
-		<li>''rgb()'' and ''rgba()'', and ''hsl()'' and ''hsla()'' are now aliases of each other
-			(all of them have an optional alpha).
+	<ol>
+		<li>predefined, wide color gamut RGB color spaces</li>
 
-		<li>''rgb()'', ''rgba()'', ''hsl()'', and ''hsla()'' have all gained a new syntax
-			consisting of space-separated arguments
-			and an optional slash-separated opacity.
-			All the color functions use this syntax form now,
-			in keeping with <a href="https://wiki.csswg.org/ideas/functional-notation#general-principles">CSS's functional-notation design principles</a>.
+		<li>''lab()'' and ''lch()'' functions, for device-independent color
 
-		<li>All uses of <<alpha-value>> now accept <<percentage>> as well as <<number>>.
+		<li>''color()'' function and ''@color-profile'' at-rule, for profiled device-dependent color, including calibrated CMYK.
+
+		<li>''device-cmyk()'' function, for specifying uncalibrated colors in an output-device-specific CMYK color space.
 
-		<li>4 and 8-digit hex colors have been added, to specify transparency.
 	</ol>
 
-	Several brand new features have been added:
+	Other technical changes:
 
 	<ol>
+		<li>Serialization of <<color>> is now specified here, rather than in the CSS Object Model
+
+		<li>''hwb()'' function, for specifying sRGB colors in the HWB notation.
 
-		<li>''hwb()'' function, for specifying colors in the HWB notation.
+		<li>Addition of named color ''rebeccapurple''.
+	</ol>
 
-		<!-- <li>''color-mod()'' function, for manipulating colors. -->
+	In addition, there have been some syntactic changes:
 
-		<li>predefined, wide color gamut RGB color spaces</li>
+	<ol>
+		<li>''rgb()'' and ''rgba()'' functions now accept <<number>> rather than <<integer>>.
 
-		<li>''lab()'' and ''lch()'' functions, for device-independent color
+		<li>''hsl()'' and ''hsla()'' functions now accept <<angle>> as well as <<number>> for hues.
 
-		<li>''color()'' function and ''@color-profile'' at-rule, for profiled device-dependent color, including calibrated CMYK.
+		<li>''rgb()'' and ''rgba()'', and ''hsl()'' and ''hsla()'' are now aliases of each other
+			(all of them have an optional alpha).
 
-		<li>''device-cmyk()'' function, for specifying uncalibrated colors in an output-device-specific CMYK color space.
+		<li>''rgb()'', ''rgba()'', ''hsl()'', and ''hsla()'' have all gained a new syntax
+			consisting of space-separated arguments
+			and an optional slash-separated opacity.
+			All the color functions use this syntax form now,
+			in keeping with <a href="https://wiki.csswg.org/ideas/functional-notation#general-principles">CSS's functional-notation design principles</a>.
 
-		<li>Serialization of <<color>> now specified here, rather than in CSS Object Model
+		<li>All uses of <<alpha-value>> now accept <<percentage>> as well as <<number>>.
 
-		<li>Addition of named color ''rebeccapurple''.
+		<li>4 and 8-digit hex colors have been added, to specify transparency.
 	</ol>
 
 Security and Privacy Considerations {#priv-sec}