[css-flexbox] Fix static position rectangle definition to be correct, since previous checkin broke it.

Author: fantasai

css-flexbox/Overview.bs

@@ -659,26 +659,28 @@ Absolutely-Positioned Flex Children</h3>
 
 	<hr>
 
-	<div class='note'>
-		This belongs in Position,
-		but assume that the <dfn>static position rectangle</dfn> of a box
-		is a rectangle,
-		usually (i.e. in block layout) corresponding to
-		the position of the “hypothetical box” described in
-		<a href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">CSS2.1§10.3.7</a>.
-		The abspos is then aligned within this rectangle by applying 'top'/etc offsets,
-		then, by default, aligning it to the <a>block-start</a> <a>inline-start</a> corner.
-	</div>
-
-	The <a>static position</a> of an absolutely positioned child of a <a>flex container</a>
-	is determined by setting the <a>static position rectangle</a> to the <a>flex container's</a> padding box,
-	then aligning the absolutely positioned child within this rectangle according to the 'justify-content' value of the <a>flex container</a>
+	In other words,
+	the <a>static position</a> of an absolutely positioned child of a <a>flex container</a>
+	is determined by setting its <a>static-position rectangle</a> to the <a>flex container's</a> content box,
+	then aligning the absolutely positioned child within this rectangle
+	according to the 'justify-content' value of the <a>flex container</a>
 	and the 'align-self' value of the child itself.
 
 	<div class='example'>
 		The effect of this is that if you set, for example,
 		''align-content: center;'' on an absolutely-positioned child of a <a>flex container</a>,
-		the child will be centered in the <a>flex container's</a> <a>cross axis</a>.
+		the child’s static position will center it in the <a>flex container's</a> <a>cross axis</a>.
+	</div>
+
+	<div class="note">
+		The <dfn>static-position rectangle</dfn> is the <a>alignment container</a>
+		used to determine the static-position offsets of an absolutely-positioned box.
+		In block layout it corresponds to the position of the “hypothetical box”
+		described in <a href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">CSS2.1&sect;10.3.7</a>.
+		(Since it has no alignment properties,
+		CSS2.1 always uses a <i>block-start</i> <i>inline-start</i> alignment
+		of the absolutely-positioned box within the <i>static-position rectangle</i>.)
+		Note that this definition will eventually move to the CSS Positioning module.
 	</div>
 
 <h3 id='item-margins'>