[css-sizing] Export some terms.

Author: tabatkins

css-sizing-3/Overview.bs

@@ -286,7 +286,7 @@ Sizing Properties</h3>
 
 	Note: Additional <a>flow-relative</a> aliases to these properties are defined in [[CSS-LOGICAL-1]].
 
-<h4 id="preferred-size-properties" dfn lt="preferred size property">
+<h4 id="preferred-size-properties" dfn export lt="preferred size property">
 Preferred Size Properties: the 'width' and 'height' properties</h4>
 
 	<pre class=propdef>
@@ -301,11 +301,11 @@ Preferred Size Properties: the 'width' and 'height' properties</h4>
 	</pre>
 
 	The 'width' and 'height' properties specify
-	the <dfn lt="preferred size">preferred</dfn> (<a>physical</a>)
+	the <dfn export lt="preferred size">preferred</dfn> (<a>physical</a>)
 	<dfn export lt="width | preferred width">width</dfn>
 	and <dfn export lt="height | preferred height">height</dfn> of the box, respectively.
 
-<h4 id="min-size-properties" dfn lt="min size property">
+<h4 id="min-size-properties" dfn export lt="min size property">
 Minimum Size Properties: the 'min-width' and 'min-height' properties</h4>
 
 	<pre class=propdef>
@@ -327,7 +327,7 @@ Minimum Size Properties: the 'min-width' and 'min-height' properties</h4>
 	Note: The initial value of ''min-width/auto'' is new;
 	in [[CSS2]] the initial value was zero.
 
-<h4 id="max-size-properties" dfn lt="max size property">
+<h4 id="max-size-properties" dfn export lt="max size property">
 Maximum Size Properties: the 'max-width' and 'max-height' properties</h4>
 
 	<pre class=propdef>