[css-color-hdr] Used DisplayHDR conformance levels in examples of low and high end devices.

Author: svgeesus

css-color-hdr/Overview.bs

@@ -19,6 +19,12 @@ Abstract: This module defines additions to CSS Color 4 to enable High Dynamic Ra
 			"publisher": "ARIB",
 			"rawDate": "2015-07-03"
 		},
+		"DisplayHDR": {
+			"title": "Summary of DisplayHDR Specs under CTS 1.1",
+			"rawDate": "2019-09-04",
+			"publisher": "VESA",
+			"href": "https://displayhdr.org/performance-criteria-cts1-1/"
+		},
 		"Rec_BT.2100": {
 			"title": "ITU-R BT.2100-2 Image parameter values for high dynamic range television for use in production and international programme exchange",
 			"publisher": "ITU",
@@ -110,11 +116,14 @@ Introducing Headroom {#introducing-headroom}
 	user preference,
 	and viewing conditions.
 
-	It is typically expressed in photographic stops,
+	It is typically expressed in photographic <strong>stops</strong>,
 	where one stop means a doubling of luminance.
 
 <div class="example" id="ex-low-headroom">
-	For example, some lower-end HDR displays 
+	For example, a low-end HDR display
+	(which just meets the requirements of
+	<a href="https://displayhdr.org/#tab-400">DisplayHDR 400</a>, 
+	the lowest tier of Vesa Certified DisplayHDR conformance [[DisplayHDR]])
 	might display media white at 
 	up to 200 cd/m<sup>2</sup>
 	while their peak white is only
@@ -124,6 +133,9 @@ Introducing Headroom {#introducing-headroom}
 
 <div class="example" id="ex-high-headroom">
 	For example, a high-end HDR display 
+	(which exceeds the requirements of
+	<a href="https://displayhdr.org/#tab-1400">DisplayHDR 1400</a>, 
+	the current highest tier of Vesa Certified DisplayHDR conformance)
 	might display media white at 
 	up to 400 cd/m<sup>2</sup>
 	while it's peak white is
@@ -215,7 +227,7 @@ The 'dynamic-range-limit' property {#the-dynamic-range-limit-property}
 			</pre>
 		</div>
 
-Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' Function {#dynamic-range-limit-mix}
+Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' function {#dynamic-range-limit-mix}
 --------------------------------------------------------
 
 	This function takes two dynamic-range-limit values,