[mediaqueries-5] rename prefers-contrast high and low to more and less

Closes w3c#2943

Author: frivoal

mediaqueries-5/Overview.bs

@@ -2629,7 +2629,7 @@ Detecting the desire for increased or decreased color contrast from elements on
 
 	<pre class='descdef mq'>
 	Name: prefers-contrast
-	Value: no-preference | high | low | forced
+	Value: no-preference | less | more | forced
 	For: @media
 	Type: discrete
 	</pre>
@@ -2647,15 +2647,15 @@ Detecting the desire for increased or decreased color contrast from elements on
 			to the system. This keyword value evaluates as false
 			in the <a>boolean context</a>.
 
-		<dt><dfn>high</dfn>
+		<dt><dfn>less</dfn>
 		<dd>
 			Indicates that user has notified the system that they
-			prefer an interface that has a higher level of contrast.
+			prefer an interface that has a lower level of contrast.
 
-		<dt><dfn>low</dfn>
+		<dt><dfn>more</dfn>
 		<dd>
 			Indicates that user has notified the system that they
-			prefer an interface that has a lower level of contrast.
+			prefer an interface that has a higher level of contrast.
 
 		<dt><dfn>forced</dfn>
 		<dd>
@@ -2666,22 +2666,22 @@ Detecting the desire for increased or decreased color contrast from elements on
 
 			<div class=advisement>
 				This does <em>not</em> necessarily indicates
-				a preference for a high contrast.
+				a preference for more contrast.
 				The colors have been forcibly adjusted
 				to match the preference of the user,
-				but that preference can be for a low contrast or a high one,
+				but that preference can be for less or more contrast,
 				or some other arrangement that is neither particularly low or high contrast.
 			</div>
 
 			Note: When the User Agent can determine whether the particular forced color scheme
 			chosen by the user is high or low contrast,
-			one of ''prefers-contrast: high'' or ''prefers-contrast: low'' should match,
+			one of ''prefers-contrast: more'' or ''prefers-contrast: less'' should match,
 			in addition to ''prefers-contrast: forced''.
 	</dl>
 
 	<div class=note>
-		Note: Authors can respond to specific user preferences for a higher or lower
-		contrast using ''prefers-contrast: high'' or ''prefers-contrast: low'',
+		Note: Authors can respond to specific user preferences for more or less
+		contrast using ''prefers-contrast: more'' or ''prefers-contrast: less'',
 		as appropriate.
 
 		Using an unqualified <code class=lang-css>@media (prefers-contrast) { … }</code>
@@ -2691,21 +2691,17 @@ Detecting the desire for increased or decreased color contrast from elements on
 		However, it is also common to reduce visual clutter
 		in response to both high and low contrast preferences.
 		In that case, it is appropriate to use <code class=lang-css>@media (prefers-contrast) { … }</code>
-		without specifying ''prefers-contrast/high'' or ''prefers-contrast/low'',
+		without specifying ''prefers-contrast/more'' or ''prefers-contrast/less'',
 		to do things like replacing background images with plain colors,
 		turning off decorative gradients,
 		or replacing border images or box shadows with simple solid borders.
-		As ''prefers-contrast/forced'', like ''prefers-contrast/high'' or ''prefers-contrast/low'',
+		As ''prefers-contrast/forced'', like ''prefers-contrast/more'' or ''prefers-contrast/less'',
 		evaluates to true in a [=boolean context=],
 		this syntax also benefits users of <a>forced colors mode</a>,
 		even when it isn't know whether their colors of choice
 		result in a high or low contrast (or something else).
 	</div>
 
-	ISSUE(2943): Split ''prefers-contrast/high'' into two levels,
-	“extremely high” (as used in MSFT's black-on-white high contrast theme)
-	and “increased (as implemented in Apple's Increased Contrast settings)?
-
 <h3 id="prefers-color-scheme">
 Detecting the desire for light or dark color schemes: the 'prefers-color-scheme' feature</h3>
 
@@ -2883,7 +2879,7 @@ Automatic handling of User Preferences</h3>
 		For instance, liquid crystal displays can be washed out and very hard to read
 		in brightly lit environments.
 		A device with such a screen and with an ambient light sensor
-		could automatically switch 'prefers-contrast' to ''prefers-contrast/high''
+		could automatically switch 'prefers-contrast' to ''prefers-contrast/more''
 		when it detects conditions that would make the screen difficult to read.
 		A user agent on a device with an e-ink display
 		would not make the same adjustment,
@@ -2892,7 +2888,7 @@ Automatic handling of User Preferences</h3>
 		In the opposite situation,
 		user agents running of device with a light-emitting screen (LCD, OLED, etc.)
 		and an ambient light sensor
-		could automatically switch 'prefers-contrast' to ''prefers-contrast/low''
+		could automatically switch 'prefers-contrast' to ''prefers-contrast/less''
 		and 'prefers-color-scheme' to ''prefers-color-scheme/dark''
 		when used in a dim environment
 		where excessive contrast and brightness would be distracting or uncomfortable to the reader.