[css-flexbox] Add clarifying note about stretch inheriting definite size from its container.

Author: tabatkins

css-flexbox/Overview.html

@@ -3063,9 +3063,11 @@ <h2 id=layout-algorithm><span class=secno>9. </span> Flex Layout Algorithm</h2>
    href="#flex-container"><i>flex container</i></a> has a definite cross
    size, any <a href="#flex-item"><i>flex items</i></a> with ‘<code
    class=css>align-self: stretch</code>’ must also be treated as having a
-   definite cross size. An <dfn id=indefinite-size
-   title="indefinite|indefinite size">indefinite size</dfn> is one that is
-   not <a href="#definite-size"><i>definite</i></a>.
+   definite cross size (since its size is determined from the size of the <a
+   href="#flex-container"><i>flex container</i></a>). An <dfn
+   id=indefinite-size title="indefinite|indefinite size">indefinite
+   size</dfn> is one that is not <a
+   href="#definite-size"><i>definite</i></a>.
 
   <p> The following sections define the algorithm for laying out a flex
    container and its contents.

css-flexbox/Overview.src.html

@@ -2324,7 +2324,8 @@ <h2 id='layout-algorithm'>
 		a size of the initial containing block, 
 		or a <var>&lt;percentage></var> that is resolved against a definite size. 
 		If a <i>single-line</i> <i>flex container</i> has a definite cross size,
-		any <i>flex items</i> with ''align-self: stretch'' must also be treated as having a definite cross size.
+		any <i>flex items</i> with ''align-self: stretch'' must also be treated as having a definite cross size
+		(since its size is determined from the size of the <i>flex container</i>).
 		An <dfn title="indefinite|indefinite size">indefinite size</dfn> is one that is not <i>definite</i>.
 
 	<p>

css-flexbox/issues-cr-2012.txt

@@ -156,7 +156,7 @@ From:     Tab Aktins
 Comment:  http://lists.w3.org/Archives/Public/www-style/2013May/0342.html
 Proposal: http://lists.w3.org/Archives/Public/www-style/2013May/0511.html
 Response: http://lists.w3.org/Archives/Public/www-style/2013Jul/0463.html
-Open
+Closed:   Accepted
 ----
 Issue 21.
 Summary:  Clarify interaction of table fixup and flex itemizing