[css-sizing-3] Improve headings

Author: fantasai

css-sizing-3/Overview.bs

@@ -277,13 +277,18 @@ Intrinsic Size Constraints</h3>
 Specifying Box Sizes</h2>
 
 <h3 id="sizing-properties">
-Sizing Properties: the 'width', 'height', 'min-width', 'min-height', 'max-width', and 'max-height' properties</h3>
+Sizing Properties</h3>
 
 	This section defines the <dfn lt="sizing property">sizing properties</dfn>
 	'width', 'height', 'min-width', 'min-height', 'max-width', and 'max-height'.
+	Their potential values are defined in the next section,
+	[[#sizing-values]].
 
 	Note: Additional <a>flow-relative</a> aliases to these properties are defined in [[CSS-LOGICAL-1]].
 
+<h4 id="preferred-size-properties">
+Preferred Size Properties: the 'width and 'height' properties</h4>
+
 	<pre class=propdef>
 	Name: width, height
 	Value: auto | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>
@@ -298,6 +303,9 @@ Sizing Properties: the 'width', 'height', 'min-width', 'min-height', 'max-width'
 	The 'width' and 'height' properties specify
 	the preferred (<a>physical</a>) <dfn>width</dfn> and <dfn>height</dfn> of the box, respectively.
 
+<h4 id="preferred-size-properties">
+Minimum Size Properties: the 'min-width and 'min-height' properties</h4>
+
 	<pre class=propdef>
 	Name: min-width, min-height
 	Value: auto | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>
@@ -317,6 +325,9 @@ Sizing Properties: the 'width', 'height', 'min-width', 'min-height', 'max-width'
 	Note: The initial value of ''min-width/auto'' is new;
 	in [[CSS2]] the initial value was zero.
 
+<h4 id="preferred-size-properties">
+Maximum Size Properties: the 'max-width and 'max-height' properties</h4>
+
 	<pre class=propdef>
 	Name: max-width, max-height
 	Value: none | <<length-percentage>> | min-content | max-content | <nobr>fit-content(<<length-percentage>>)</nobr>

cssom-1/Overview.bs

@@ -2807,7 +2807,7 @@ revisions of CSS while the implementation of
 {{Window/getComputedStyle()}} had to
 remain the same for compatibility with deployed scripts. To address this
 issue this specification introduces the concept of a
-<dfn>resolved value</dfn>.
+<dfn export>resolved value</dfn>.
 
 The <a>resolved value</a> for a given longhand property can be determined
 as follows: