[css-images-3] Per WG resolution, change image-orientation's initial value to 'from-image'.

Author: tabatkins

css-images-3/Overview.bs

@@ -1506,8 +1506,8 @@ Image Processing {#image-processing}
 
 	<pre class='propdef'>
 	Name: image-orientation
-	Value: none | from-image | <<angle>> | [ <<angle>>? flip ]
-	Initial: none
+	Value: from-image | none | <<angle>> | [ <<angle>>? flip ]
+	Initial: from-image
 	Applies to: all elements
 	Inherited: yes
 	Computed value: the specified keyword, or an <<angle>>, rounded and normalized (see text), plus optionally a ''flip'' keyword
@@ -1544,6 +1544,12 @@ Image Processing {#image-processing}
 			this value computes to ''image-orientation/none''.
 	</dl>
 
+	Note: This property previously used ''image-orientation/none'' as its initial value.
+	It is believed that using ''from-image'' as the initial value
+	will produce a generally better user experience,
+	and minimal breakage,
+	but future compat data as UAs attempt to make the change will confirm that.
+
 	Values other than ''image-orientation/none'' and ''from-image'' are
 	<em>optional</em> to implement and <em>deprecated</em> in CSS.
 	They have the following meanings: