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

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.