deal with omitted XSL WG comment on [0,360)

Author: svgeesus

css3-color/Overview.src.html

@@ -537,7 +537,7 @@ <h4 id="hsl-color">HSL color values</h4>
 Hue is represented as an angle of the color circle (i.e. the rainbow
  represented in a circle).  This angle is so typically measured in degrees that the unit is implicit in CSS; syntactically, only a &lt;number&gt; is given.
 By definition red=0=360, and the other colors are spread around the
-      circle, so green=120, blue=240, etc.  As an angle, it implicitly wraps around such that -120=240 and 480=120.  One way an implementation could normalize such an angle x to the range [0,360) is to compute (((x mod 360) + 360) mod 360). Saturation and lightness
+      circle, so green=120, blue=240, etc.  As an angle, it implicitly wraps around such that -120=240 and 480=120.  One way an implementation could normalize such an angle x to the range [0,360) (<em>i.e.</em> zero degrees, inclusive, to 360 degrees, exclusive) is to compute (((x mod 360) + 360) mod 360). Saturation and lightness
       are represented as percentages. 100% is full saturation, and 0%
       is a shade of
     gray. 0% lightness is black, 100% lightness is white, and 50%