[css-images-3] Be more precise about deprecation / optionality of image-orientation. #4164

Author: fantasai

css-images-3/Overview.bs

@@ -1518,8 +1518,7 @@ Image Processing {#image-processing}
 	Animation type: discrete
 	</pre>
 
-	<strong>This property is deprecated,
-	and is <em>optional</em> for implementations.</strong>
+	<strong>This property is <em>optional</em> for implementations.</strong>
 
 	Note: This property previously used ''image-orientation/none'' as its initial value.
 	It is believed that using ''from-image'' as the initial value
@@ -1580,6 +1579,9 @@ Image Processing {#image-processing}
 
 			This value only applies to content images;
 			decorative images continue to behave as ''from-image''.
+			This value is deprecated
+			and is optional for implementations
+			except those conforming to [[!CSS-PRINT]].
 
 		<dt><dfn><<angle>>? flip</dfn>
 		<dd>
@@ -1590,6 +1592,8 @@ Image Processing {#image-processing}
 
 			This value only applies to content images;
 			decorative images continue to behave as ''from-image''.
+			This value is deprecated
+			and is optional for implementations.
 
 			Note: This value is only necessary to represent all 8 possible EXIF orientations that <a value for=image-orientation>from-image</a> can produce.
 	</dl>