[css-color] fix Rec.2020 and Rec2020 to be rec2020, and DCI-P3 P3 to either (consistently) dci-p3 or p3.

Add back rendering intent for FPWD.

Author: svgeesus

css-color/Overview.bs

@@ -1721,13 +1721,13 @@ The identifier is either one of the predefined spaces
 	<p class="issue">Need to add choice of quoted string or number+, to allow
 		for named color profiles.</p>
 
-<h3 id="predefined">Predefined colorspaces: DCI P3 and Rec.2020.</h3>
+<h3 id="predefined">Predefined colorspaces: dci-p3 and rec2020.</h3>
 
-These two colorspaces are indicated by using the predefined identifiers <i>p3</i> or 
+These two colorspaces are indicated by using the predefined identifiers <i>dci-p3</i> or 
 <i>rec2020</i> in the color function. No ''<@color-profile>'' at-rule is needed for these
 predefined names; if one is supplied, it will be ignored.
 
-The DCI P3 [[!DCI-P3]] colorspace has the following characteristics:
+The dci-p3 [[!DCI-P3]] colorspace has the following characteristics:
 
 <table>
 	<tr><th>Red chromaticity</th><td>x=0.680 y=0.320</td></tr>
@@ -1737,15 +1737,15 @@ The DCI P3 [[!DCI-P3]] colorspace has the following characteristics:
 	<tr><th>Transfer function</th><td>1/2.6</td></tr>
 </table>
 
-<p class="issue">The defining spec for DCI-P3 is not freely available. It costs USD 240.
+<p class="issue">The defining spec for dci-p3 is not freely available. It costs USD 240.
 	There is a Wikipedia article, which is non-authoritative and of unknown accuracy 
 	(particularly for the transfer function and viewing conditions).
 </p>
 
-<p class="issue">DCI transfer function is gamma 1/2.6 while Apple P3 displays use gamma 1/2.2.</p>
+<p class="issue">DCI transfer function for P3 is gamma 1/2.6 while Apple P3 displays use gamma 1/2.2.</p>
 
 
-The ITU Rec.2020 [[!Rec.2020]] 
+The rec2020 [[!Rec.2020]] 
 	colorspace has the following characteristics:
 
 <table>
@@ -1756,7 +1756,7 @@ The ITU Rec.2020 [[!Rec.2020]]
 	<tr><th>Transfer function</th><td>see below</td></tr>
 </table>
 
-Rec.2020 transfer function has the same form as the one for sRGB, but with 
+rec2020 transfer function has the same form as the one for sRGB, but with 
 the constants at higher precision to cope with 10 or 12-bit components:
 
 <pre class="lang-javascript"> E < β ? 4.5 * E : α * Math.pow(E, 0.45) - (α - 1);
@@ -1773,16 +1773,16 @@ although in practice all but the first step are linear calculations and can be c
 <!-- make these steps links to the appropriate section in a calculations appendix -->
 <ol><li>Convert from gamma-corrected RGB to linear-light RGB (undo gamma correction)
 	<li>Convert from linear RGB to CIE XYZ
-	<li>Convert from a D65 whitepoint (used by both p3 and rec2020) to the D50 whitepoint used 
+	<li>Convert from a D65 whitepoint (used by both dci-p3 and rec2020) to the D50 whitepoint used 
 		in Lab, with the Bradford transform
 	<li>Convert D50-adapted XYZ to Lab
 </ol>
 
-<p class="issue">Canvas proposes adding a 16bit half-float linear 2020 space</p>
+<p class="issue">Canvas proposes adding a 16bit half-float <em>linear</em> rec2020 space</p>
 
 <h4 id="lab-to-predefined">Converting Lab to predefined colorspaces</h4>
 
-Conversion from Lab to p3 or rec2020 also requires multiple steps, and again in practice all 
+Conversion from Lab to dci-p3 or rec2020 also requires multiple steps, and again in practice all 
 but the last step are linear calculations and can be combined.
 
 <ol>
@@ -1820,7 +1820,8 @@ in practice, but that could change in the future. or we could add format later,
 a need, and make the default ICC if not specified -->
 
 <!-- we decided in San Francisco to not allow renering intent to be specified in the CSS; 
-just use the rendering intent provided by the profile.
+just use the rendering intent provided by the profile. Howerver, leave in for FPWD. -->
+
 
 A third, optional descriptor defines the <dfn data-dfn-type="descriptor" for="@color-profile">rendering intent</dfn> to use when mapping colors 
 from a larger to a smaller gamut.
@@ -1897,7 +1898,7 @@ There are four values for rendering intent
 	pixels. Out of gamut colors should be converted to colors that have the same saturation 
 	but fall just inside the gamut.</p> </dd>
 </dl>
-	-->
+
 
 <pre class="prod">
 	<dfn at-rule >FIX ME: MISSING</dfn>