[css-sizing-4] Prepare for FPWD

Author: xfq

css-sizing-4/Overview.bs

@@ -5,12 +5,11 @@ Level: 4
 Status: ED
 Work Status: Exploring
 Group: csswg
-ED: https://drafts.csswg.org/css-sizing
-TR: https://www.w3.org/TR/css-sizing/
+ED: https://drafts.csswg.org/css-sizing-4/
+TR: https://www.w3.org/TR/css-sizing-4/
 Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Editor: Jen Simmons, Mozilla, http://jensimmons.com/
-Previous version: https://www.w3.org/TR/2012/WD-css3-sizing-20120927/
 Abstract: This module extends the CSS sizing properties with keywords that represent content-based "intrinsic" sizes and context-based "extrinsic" sizes, allowing CSS to more easily describe boxes that fit their content or fit into a particular layout context. This is a delta spec over CSS Sizing Level 3.
 Ignored Terms: block-level box
 </pre>
@@ -116,6 +115,7 @@ New Sizing Values: the ''stretch'', ''fit-content'', and ''contain'' keywords</h
 			i.e. min(''width/max-content'', max(''width/min-content'', ''width/stretch'')).
 
 		<dt><dfn>contain</dfn>
+		<dd>
 			If the box has a [=preferred aspect ratio=],
 			applies [=contain-fit sizing=],
 			attempting to fit into the box’s constraints