I forgot to make the change to how 'flex' animates some time ago, to match what Daniel Holbert suggests.

--HG--
extra : rebase_source : ffeadc2f803fc6cbb66f8c16aea627e920e64e63

Author: tabatkins

css3-flexbox/Overview.html

@@ -29,11 +29,11 @@
 
    <h1 id=head-box-flexible>CSS Flexible Box Layout Module</h1>
 
-   <h2 class="no-num no-toc" id=w3c-working>Editor's Draft, 6 April 2012</h2>
+   <h2 class="no-num no-toc" id=w3c-working>Editor's Draft, 17 April 2012</h2>
 
    <dl>
     <dt>This version:
-     <!--<dd><a href="http://www.w3.org/TR/2012/ED-css3-flexbox-20120406/">http://www.w3.org/TR/2012/WD-css3-flexbox-20120406/</a>-->
+     <!--<dd><a href="http://www.w3.org/TR/2012/ED-css3-flexbox-20120417/">http://www.w3.org/TR/2012/WD-css3-flexbox-20120417/</a>-->
 
 
     <dd><a
@@ -1249,8 +1249,8 @@ <h2 id=flexibility><span class=secno>7. </span> Flexibility: the &lsquo;<a
    the future other values may be introduced that are not applicable as
    length component). If omitted, the preferred size defaults to &lsquo;<code
    class=css>0px</code>&rsquo;. If the <code>&lt;preferred-size></code>
-   component is &lsquo;<code class=css>auto</code>&rsquo; on a <a
-   href="#flexbox-item"><i>flexbox item</i></a>, the <a
+   component is &lsquo;<code class=css>auto</code>&rsquo; on a child of a <a
+   href="#flexbox"><i>flexbox</i></a>, the <a
    href="#preferred-size"><i>preferred size</i></a> is the <a
    href="#main-size-property"><i>main size property</i></a>&apos;s value.
 
@@ -1264,8 +1264,8 @@ <h2 id=flexibility><span class=secno>7. </span> Flexibility: the &lsquo;<a
    "0 0 auto".
 
   <p>The &lsquo;<a href="#flex"><code class=property>flex</code></a>&rsquo;
-   property is transitionable if the element is a <a
-   href="#flexbox-item"><i>flexbox item</i></a> and the <a
+   property is transitionable if the element is a child of a <a
+   href="#flexbox"><i>flexbox</i></a> and the <a
    href="#preferred-size"><i>preferred size</i></a> is transitionable, by
    transitioning the <a href="#positive-flexibility"><i>positive
    flexibility</i></a>, <a href="#negative-flexibility"><i>negative

css3-flexbox/Overview.src.html

@@ -600,13 +600,13 @@ <h2 id='flexibility'>
 
 	<p><code>&lt;pos-flex></code> and <code>&lt;neg-flex></code> are non-negative <code>&lt;number>s</code>. The <code>&lt;pos-flex></code> component sets the <i>positive flexibility</i>; if omitted, the <i>positive flexibility</i> defaults to ''1''. The <code>&lt;neg-flex></code> component sets the <i>negative flexibility</i>; if omitted, it defaults to ''0''.</p>
 
-	<p>The <code>&lt;preferred-size></code> component sets the preferred size. It can be set to any value that would be valid in the 'width' or 'height' property, except values that are not applicable to a component value (of values defined in CSS2.1, only &#39;inherit&#39; is not valid for <code>&lt;preferred-size></code>; in the future other values may be introduced that are not applicable as length component). If omitted, the preferred size defaults to ''0px''. If the <code>&lt;preferred-size></code> component is ''auto'' on a <i>flexbox item</i>, the <i>preferred size</i> is the <i>main size property</i>&apos;s value.</p>
+	<p>The <code>&lt;preferred-size></code> component sets the preferred size. It can be set to any value that would be valid in the 'width' or 'height' property, except values that are not applicable to a component value (of values defined in CSS2.1, only &#39;inherit&#39; is not valid for <code>&lt;preferred-size></code>; in the future other values may be introduced that are not applicable as length component). If omitted, the preferred size defaults to ''0px''. If the <code>&lt;preferred-size></code> component is ''auto'' on a child of a <i>flexbox</i>, the <i>preferred size</i> is the <i>main size property</i>&apos;s value.</p>
 
 	<p>If the <code>&lt;preferred-size></code> is ''0'', it <strong>must</strong> be specified with a unit (like ''0px'') to avoid ambiguity; unitless zero will either be interpreted as as one of the flexibilities, or is a syntax error.</p>
 
 	<p>The keyword 'none' computes to "0 0 auto". </p>
 
-	<p>The 'flex' property is transitionable if the element is a <i>flexbox item</i> and the <i>preferred size</i> is transitionable, by transitioning the <i>positive flexibility</i>, <i>negative flexibility</i>, and <i>preferred size</i> independently.</p>
+	<p>The 'flex' property is transitionable if the element is a child of a <i>flexbox</i> and the <i>preferred size</i> is transitionable, by transitioning the <i>positive flexibility</i>, <i>negative flexibility</i>, and <i>preferred size</i> independently.</p>
 
 	<div class='example'>
 		<p>Flexibility allows elements to respond directly to the available space,