[css-color-4] valid profiles

Author: svgeesus

css-color-4/Overview.bs

@@ -364,8 +364,11 @@ Accessibility and Conveying Information By Color</h3>
 
 	Tagged RGB images,
 	and tagged images using a transformation of RGB such as YCbCr,
+	if the color profile or other identifying information is valid,
 	must be treated as being in the specified color space.
 
+	If the color profile or other identifying information is invalid, the image is treated as [=untagged images=]
+
 	For example, when a browser running on a system with a Display P3 monitor
 	displays an JPEG image
 	tagged as being in the Adobe® RGB (1998) [[!AdobeRGB]]