[mediaqueries-5] Clarify that inverted-colors is for non-smart pixel-level invert only

Author: frivoal

mediaqueries-5/Overview.bs

@@ -487,6 +487,16 @@ Detecting the desire for inverted colors on the display: the 'inverted-colors' f
 		<dd>
 			All pixels within the displayed area have been inverted.
 
+			This value must not match
+			if the User Agent has done some kind of content aware inversion
+			such as one that preserves the images.
+
+			Note: This is because the goal of this media feature
+			is to enable authors to mitigate the undesirable effects of the non content aware approach
+			that invert <em>all</em> the pixels.
+			If the author were to take counter measures even in the content-aware cases,
+			their counter measures and the UA's would be at risk of cancelling each other.
+
 	</dl>
 
 	<div class="example">
@@ -502,12 +512,6 @@ Detecting the desire for inverted colors on the display: the 'inverted-colors' f
 		</pre>
 	</div>
 
-	ISSUE: This is implemented in a wide variety of ways
-	some that do or do not preserve hue and/or images original colors
-	and there is no clear way for authors to react to this media query being true.
-	(See <a href="https://github.com/w3c/csswg-drafts/issues/3807">discussion</a>.)
-	Possible ways forward: add more values to reflect variations, or drop the feature.
-
 <h3 id="prefers-reduced-motion">
 Detecting the desire for less motion on the page: the 'prefers-reduced-motion' feature</h3>