[css-overflow-3] Improve handling of print.

Author: fantasai

css-overflow-3/Overview.bs

@@ -359,8 +359,9 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 			whether or not any of its content is clipped.
 			This avoids any problem with scrollbars appearing
 			and disappearing in a dynamic environment.
-			When this value is specified and the target medium is ''print'',
-			overflowing content may be printed.
+			When the target medium is ''print'',
+			overflowing content may be printed;
+			it is not defined where it may be printed.
 
 		<dt><dfn>auto</dfn>
 		<dd>
@@ -380,15 +381,24 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 <h3 id="static-media">
 Overflow in Print and Other Static Media</h3>
 
-	<p class="issue">
-		This specification should define useful behavior
-		for all values of 'overflow'
-		in static media (such as print).
-		Current implementation behavior is quite poor and
-		produces unexpected results when authors have not considered
-		what will happen when
-		the content they produce for interactive media
-		is printed.
+	<p class="advisement">
+		Since scrolling is not possible in static media
+		(such as print)
+		authors should be careful to make content accessible in such media,
+		for example by using ''@media print, (update: none) { &hellip; }''
+		to adjust layout such that all relevant content
+		is simultaneously visible.
+
+	On <a>scroll containers</a> in <a>static media</a>
+	with an 'overflow' value of ''overflow/auto'' or ''overflow/scroll''
+	(but not ''overflow/hidden'')
+	UAs may display an indication of any scrollable overflow,
+	such as by displaying scrollbars
+	or an ellipsis.
+
+	Note: Not all <a>paged media</a> is <a lt="static media">static</a>;
+	for example, e-book readers page content,
+	but are <a lt="interactive media">interactive</a>.
 
 <h3 id="scrollbar-layout">
 Scrollbars and Layout</h3>