[css-color-4] Define where percentages are allowed. See w3c#5894

Author: svgeesus

css-color-4/Overview.bs

@@ -3150,6 +3150,9 @@ Profiled, Device-dependent Colors</h2>
 		(such as ''display-p3'');
 		if it is a <<dashed-ident>> it denotes a custom
 		colorspace, defined by a ''@color-profile'' rule.
+		Individual <a href="#predefined">predefined colorspaces</a>
+		may further restrict whether <<number>>s or <<percentage>>s
+		or both, may be used.
 
 		If the <<ident>> names a non-existent colorspace
 		(a name that does not match one of the <a href="#predefined">predefined colorspaces</a>),
@@ -3348,6 +3351,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 				<tr><th>White luminance</th><td colspan="2">80.0 cd/m<sup>2</sup></td></tr>
 				<tr><th>Black luminance</th><td colspan="2">0.80 cd/m<sup>2</sup></td></tr>
 				<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
+				<tr>
+					<th>Percentages</th>
+					<td  colspan="2">Allowed for R, G and B</td>
+				</tr>
 			</table>
 
 			<pre class="lang-javascript">
@@ -3396,6 +3403,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 				<tr><th>White luminance</th><td colspan="2">80.0 cd/m<sup>2</sup></td></tr>
 				<tr><th>Black luminance</th><td colspan="2">0.80 cd/m<sup>2</sup></td></tr>
 				<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
+				<tr>
+					<th>Percentages</th>
+					<td  colspan="2">Allowed for R, G and B</td>
+				</tr>
 			</table>
 
 			<figure>
@@ -3447,6 +3458,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 				<tr><th>White luminance</th><td colspan="2">160.0 cd/m<sup>2</sup></td></tr>
 				<tr><th>Black luminance</th><td colspan="2">0.5557 cd/m<sup>2</sup></td></tr>
 				<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
+				<tr>
+					<th>Percentages</th>
+					<td  colspan="2">Allowed for R, G and B</td>
+				</tr>
 			</table>
 
 			<figure>
@@ -3504,6 +3519,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 					<tr><th>White luminance</th><td colspan="2">160.0 to 640.0 cd/m<sup>2</sup></td></tr>
 					<tr><th>Black luminance</th><td colspan="2">See text</td></tr>
 					<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
+					<tr>
+						<th>Percentages</th>
+						<td  colspan="2">Allowed for R, G and B</td>
+					</tr>
 				</table>
 
 				<pre class="lang-javascript">
@@ -3555,6 +3574,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 				<tr><th>White chromaticity</th><td>0.3127</td><td>0.3290</td><td>(D65)</td></tr>
 				<tr><th>Transfer function</th><td colspan="2">1/2.4 (see note)</td></tr>
 				<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
+				<tr>
+					<th>Percentages</th>
+					<td  colspan="2">Allowed for R, G and B</td>
+				</tr>
 			</table>
 
 			Note: rec2020 references a different transfer curve for cameras. However
@@ -3590,6 +3613,15 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 				but can occur as a result of chromatic adaptation,
 				and likewise must not be clamped.
 
+				It has the following characteristics:
+
+				<table>
+					<tr>
+						<th>Percentages</th>
+						<td  colspan="2">Disallowed</td>
+					</tr>
+				</table>
+
 				<div class="example" id="ex-xyz">
 					These are exactly equivalent:
 
@@ -3624,6 +3656,15 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 					predefined-013.html
 				</wpt>
 
+				It has the following characteristics:
+
+				<table>
+					<tr>
+						<th>Percentages</th>
+						<td  colspan="2">Required for L; disallowed for a and b.</td>
+					</tr>
+				</table>
+
 	</dl>
 
 <h4 id="predefined-to-lab">