[css-color] small clarifications and cleanup

Author: svgeesus

css-color/Overview.bs

@@ -1,4 +1,4 @@
-<h1>CSS Color Module Level 4</h1>
+<h1>CSS Color Module Level 4</h1>
 
 <pre class=metadata>
 Status: ED
@@ -40,7 +40,7 @@ Introduction</h2>
 
 	<em>This section is not normative.</em>
 
-	This module describes CSS properties which allow authors to specify the foreground color and opacity of an element.
+	This module describes CSS properties which allow authors to specify the foreground color and opacity of the text content of an element.
 	This module also describes in detail the CSS <<color>> value type.
 
 
@@ -64,19 +64,20 @@ Foreground Color: the 'color' property</h2>
 	Computed value: an RGBA color
 	</pre>
 
-	This property describes the foreground color of an element's text content.
+	This property describes the foreground fill color of an element's text content.
 	In addition, it provides the value that ''currentcolor'' resolves to.
 	If the ''currentcolor'' keyword is set on the 'color' property itself, it is treated as ''color: inherit''.
 
-	The initial value of this property is a UA-defined color.
-	In many existing user-agents, it is ''black''.
+	The initial value of this property is ''black''.
 
-	There are different ways to specify lime green:
+	There are several different ways to syntactically specify a given color.
+For example, to specify lime green:
 
 	<div class="example">
 		<pre class="lang-css">
 		em { color: lime; }              /* color keyword   */
 		em { color: rgb(0,255,0); }      /* RGB range 0-255 */
+		em { color: rgb(0.0,100.0,0.0); }      /* RGB range 0%-100% */
 		</pre>
 	</div>
 
@@ -86,29 +87,29 @@ Foreground Color: the 'color' property</h2>
 	</dl>
 
 <h2 id='color-type'>
-Representing Colors: the <<color>> type</h2>
+Representing sRGB Colors: the <<color>> type</h2>
 
-	CSS colors are represented by a triplet of values--
+	CSS colors in the sRGB color space are represented by a triplet of values--
 	red, green, and blue--
 	identifying a point in the sRGB color space [[!SRGB]].
 	This is an internationally-recognized, device-independent color space,
 	and so is useful for specifying colors that will be displayed on a computer screen,
-	but is also useful for displaying colors on other types of devices, like printers.
+	but is also useful for specifying colors on other types of devices, like printers.
 	(See [[COLORIMETRY]].)
 	Additionally, every color is accompanied by an alpha component,
 	indicating how transparent it is,
-	and how much of the backdrop one can see behind the color.
+	and thus how much of the backdrop one can see behind the color.
 	The components are also sometimes called "channels".
 	Each channel has a minimum and maximum value,
 	and can take any value between those two.
 
 	While all colors share an underlying storage format,
 	CSS contains several syntaxes for <em>specifying</em> <<color>> values.
-	Some directly specify the RGB color,
+	Some directly specify the sRGB color,
 	such as the ''rgb()'' and ''rgba()'' functions
 	and the hex notation.
 	Others are more human-friendly to write and understand,
-	and are converted to an RGB color by CSS,
+	and are converted to an sRGB color by CSS,
 	such as the ''hsl()'' and ''hsla()'' functions,
 	or the long list of named colors defined by CSS.
 
@@ -136,7 +137,8 @@ Representing Colors: the <<color>> type</h2>
 Notes On Using Colors</h3>
 
 	Although colors can add significant amounts of information to
-	document and make them more readable, please consider the
+	documents and make them more readable, color by itself should not be the sole 
+	means to convey important information. Please consider the
 	W3C Web Content Accessibility Guidelines [[WCAG20]] when including color in your documents.
 
 	<ul>
@@ -596,6 +598,7 @@ Named Colors</h2>
 	</table>
 
 	Note: this list of colors and their definitions is a superset of the list of <a href="http://www.w3.org/TR/SVG/types.html#ColorKeywords">named colors defined by SVG 1.1</a>.
+For historical reasons, this is also referred to as the X11 color set.
 
 <h3 id='transparent-color'>
 The ''transparent'' keyword</h3>
@@ -1630,6 +1633,7 @@ Specifying Grays: the ''gray()'' functional notation</h2>
 
 		Alternately, base it on relative contrast ratios somehow?
 		#757575 is the gray that lives exactly between white and black, in contrast-ratio space.
+		<!-- citation required -->
 		Taking 0% to be black, 100% to be white, and 50% to be #757575,
 		you convert between contrast-ratio space and luminance space
 		with <code>L = 21^p</code>,
@@ -1638,12 +1642,12 @@ Specifying Grays: the ''gray()'' functional notation</h2>
 
 
 <h2 id='cmyk-colors'>
-CMYK Colors: the ''device-cmyk()'' function</h2>
+Device-dependent CMYK Colors: the ''device-cmyk()'' function</h2>
 
 	While screens typically display colors directly with RGB pixels,
 	printers often represent colors in different ways.
 	In particular, one of the most common print-based ways of representing colors is with CMYK:
-	a combination of cyan, magenta, yellow, and black.
+	a combination of cyan, magenta, yellow, and black which yields a particular color on that device.
 	The ''device-cmyk()'' function allows authors to specify a color in this way:
 
 	<pre class='prod'>
@@ -2133,6 +2137,7 @@ Color Blending: the ''blend'' and ''blenda'' adjusters</h3>
 		Should we swap the defaults,
 		so ''blend()'' does the alpha blending,
 		and another name (or maybe another parameter) ignores alpha like ''blend()'' currently does?
+Check with definitions in CSS compositing and blending module.
 
 
 <h3 id='contrast-adjuster'>