[css-color-4] Unbounded HWB, fix w3c#8444

Author: svgeesus

css-color-4/Overview.bs

@@ -440,13 +440,17 @@ Value Definitions</h3>
 	but still be outside the range of colors
 	that can be produced by an output device
 	(a screen, projector, or printer)
+
+	<!-- unbounded hsl
 	or the range of colors that may be represented by a given color model
-	(for example HSL or HWB).
+	(for example HSL or HWB). -->
+
 	It is said to be <dfn export>out of gamut</dfn>.
 
 
 	Each [=valid color=] is either <dfn export>in-gamut</dfn> 
-	for a particular output device (screen, or printer) or color space,
+	for a particular output device (screen, or printer) 
+	<!-- unbounded hsl or color space, -->
 	or it is [=out of gamut=].
 
 	<div class="example" id="ex-oog">
@@ -2516,12 +2520,18 @@ HWB Colors: ''hwb()'' function</h2>
 	as a percentage from ''0%'' (no whiteness) to ''100%'' (full whiteness).
 	Similarly, the third argument specifies the amount of black to mix in,
 	also from ''0%'' (no blackness) to ''100%'' (full blackness).
+
+	<!-- unbounded hwb
 	Values outside of these ranges
 	are not invalid,
 	but are clamped to the ranges defined here at parsed-value time.
 	If the sum of these two arguments is greater than 100%,
 	then at parsed-value time they are further normalized to add up to 100%,
-	with the same relative ratio.
+	with the same relative ratio. -->
+
+	Values outside of these ranges
+	are not invalid,
+	and correspond to colors outside the sRGB gamut.
 
 	The fourth argument specifies the alpha channel of the color.
 	It's interpreted identically to the fourth argument of the ''rgb()'' function.