[mediaqueries-4] made adjustments recommended by Chris and put in that contrast of the display should be defined by the UA

Author: Greg Whitworth

mediaqueries-4/Overview.bs

@@ -1712,17 +1712,25 @@ High dynamic range (HDR) represents the combination of brightness, color depth,
 	<dt><dfn>high</dfn>
 	<dd>
 		If the following are true for the UA and the output device:
-		* color gamut is <a>p3</a>, <a>rec2020</a>
+		* color gamut is <a>p3</a> or <a>rec2020</a>
 		* color depth is greater than 24 bit
-		* has a high contrast ratio
+		* has a <a href="#contrast-of-display">high contrast ratio</a>
 	<dt><dfn>standard</dfn>
 	<dd>
 		If the following are true for the UA and the output device:
 		* color gamut is <a>sRGB</a>
 		* color depth is 24 bit or 8 bit per color component of RGB
-		* has a low contrast ratio
+		* has a <a href="#contrast-of-display">low contrast ratio</a>
 </dl>
 
+<h3 id="contrast-of-display">
+	Determining contrast of display</h3>
+
+This text is non-normative. There currently is no agreed upon standardization of 
+high contrast ratio or low contrast ratio as it relates to displays. 
+As such, the determination for <a>dynamic-range</a> and <a>video-dymanic-range</a> 
+will be defined by the user agent.
+
 <h3 id="video-prefixed-properties">
 Handling bi-plane scenarios</h3>
 
@@ -1774,15 +1782,15 @@ High dynamic range (HDR) represents the combination of brightness, color depth,
 	<dt><dfn>high</dfn>
 	<dd>
 		If the following are true for the UA and the output device's video plane:
-		* color gamut is <a>p3</a>, <a>rec2020</a>
+		* color gamut is <a>p3</a> or <a>rec2020</a>
 		* color depth is greater than 24 bit
-		* has a high contrast ratio
+		* has a <a href="#contrast-of-display">high contrast ratio</a>
 	<dt><dfn>standard</dfn>
 	<dd>
 		If the following are true for the UA and the output device's video plane:
 		* color gamut is <a>sRGB</a>
 		* color depth is 24 bit or 8 bit per color component of RGB
-		* has a low contrast ratio
+		* has a <a href="#contrast-of-display">low contrast ratio</a>
 </dl>
 
 <h3 id="video-width">