[css-lists-3] Blockify outside list marker boxes per w3c#4448 (comment)

Author: fantasai

css-lists-3/Overview.bs

@@ -394,7 +394,8 @@ Positioning Markers: The 'list-style-position' property</h3>
 		<dt><dfn id='list-style-position-outside'>outside</dfn>
 		<dd>
 			If the <a>list item</a> is a <a>block container</a>:
-			the marker box is outside the principal block box;
+			the marker box is [=blockified=] [[!CSS-DISPLAY-3]]
+			and placed outside the [=principal box|principal block box=];
 			however, the position of the list-item marker adjacent to floats is undefined.
 			CSS does not specify the precise location of the marker box
 			or its position in the painting order,
@@ -1479,6 +1480,12 @@ Acknowledgments</h2>
 
 This section documents the changes since previous publications.
 
+<h3 id="changes-20190817">Changes since the 17 August 2019 WD</h3>
+
+	<ul>
+		<li>Specify that ''outside'' list markers are [=blockified=].
+	</ul>
+
 <h3 id="changes-20190425">Changes since the 25 April 2019 WD</h3>
 
 	<ul>
@@ -1518,5 +1525,5 @@ This section documents the changes since previous publications.
 
 		<li>The 'counter-set' property has been added.
 
-		<li>Allowed for <a>inline-level</a> <a>list items</a>, as introduced in [[css-display-3]].
+		<li>Allowed for <a>inline-level</a> <a>list items</a>, as introduced in [[CSS-DISPLAY-3]].
 	</ol>