Merge pull request w3c#19 from ewilligers/shorthand-syntax

Shorthand syntax when -x and -y values distinct

index.bs

@@ -175,8 +175,8 @@ axis should be considered independently.
 
 <pre class=propdef>
 Name: scroll-boundary-behavior
-Value: contain | none | auto
-Initial: auto
+Value: [ contain | none | auto ]{1,2}
+Initial: auto auto
 Applies to: <a>scroll container</a> elements
 Inherited: no
 Media: visual
@@ -185,6 +185,8 @@ Animatable: no
 Canonical order: <abbr title="follows order of property value definition">per grammar</abbr>
 </pre>
 
+The two values specify the behavior in the horizontal and vertical direction, respectively. If only one value is specified, the second value defaults to the same value.
+
 Values have the following meanings:
 
 <dl dfn-for="scroll-boundary-behavior, scroll-boundary-behavior-x, scroll-boundary-behavior-y" dfn-type="value">

index.html

@@ -1617,10 +1617,10 @@ <h2 class="heading settled" data-level="5" id="scroll-boundary-behavior-properti
       <td><dfn class="dfn-paneled css" data-dfn-type="property" data-export="" id="propdef-scroll-boundary-behavior">scroll-boundary-behavior</dfn>
      <tr class="value">
       <th>Value:
-      <td class="prod">contain <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-4/#comb-one" id="ref-for-comb-one②">|</a> none <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-4/#comb-one" id="ref-for-comb-one③">|</a> auto
+      <td class="prod">[ contain <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-4/#comb-one" id="ref-for-comb-one②">|</a> none <a data-link-type="grammar" href="https://drafts.csswg.org/css-values-4/#comb-one" id="ref-for-comb-one③">|</a> auto ]<a data-link-type="grammar" href="https://drafts.csswg.org/css-values-4/#mult-num-range" id="ref-for-mult-num-range">{1,2}</a>
      <tr>
       <th>Initial:
-      <td>auto
+      <td>auto auto
      <tr>
       <th>Applies to:
       <td><a data-link-type="dfn" href="https://drafts.csswg.org/css-overflow-3/#scroll-container" id="ref-for-scroll-container①⑤">scroll container</a> elements
@@ -1643,6 +1643,7 @@ <h2 class="heading settled" data-level="5" id="scroll-boundary-behavior-properti
       <th>Animatable:
       <td>no
    </table>
+   <p>The two values specify the behavior in the horizontal and vertical direction, respectively. If only one value is specified, the second value defaults to the same value.</p>
    <p>Values have the following meanings:</p>
    <dl>
     <dt><dfn class="dfn-paneled css" data-dfn-for="scroll-boundary-behavior, scroll-boundary-behavior-x, scroll-boundary-behavior-y" data-dfn-type="value" data-export="" id="valdef-scroll-boundary-behavior-contain">contain</dfn> 
@@ -1840,6 +1841,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
    <li>
     <a data-link-type="biblio">[css-values-4]</a> defines the following terms:
     <ul>
+     <li><a href="https://drafts.csswg.org/css-values-4/#mult-num-range">{a,b}</a>
      <li><a href="https://drafts.csswg.org/css-values-4/#comb-one">|</a>
     </ul>
   </ul>
@@ -1869,8 +1871,8 @@ <h2 class="no-num no-ref heading settled" id="property-index"><span class="conte
     <tbody>
      <tr>
       <th scope="row"><a class="css" data-link-type="property" href="#propdef-scroll-boundary-behavior" id="ref-for-propdef-scroll-boundary-behavior⑤">scroll-boundary-behavior</a>
-      <td>contain | none | auto
-      <td>auto
+      <td>[ contain | none | auto ]{1,2}
+      <td>auto auto
       <td>scroll container elements
       <td>no
       <td>n/a