Slightly rephrase the abspos staticpos calculations for clarity.

Author: tabatkins

css-flexbox/Overview.bs

@@ -653,7 +653,8 @@ Flex Items</h2>
 <h3 id='abspos-items'>
 Absolutely-Positioned Flex Children</h3>
 
-	An absolutely-positioned child of a <a>flex container</a> does not participate in flex layout.
+	As it is out-of-flow,
+	an absolutely-positioned child of a <a>flex container</a> does not participate in flex layout.
 
 	The <a href="https://www.w3.org/TR/CSS2/visudet.html#abs-non-replaced-width">static position</a>
 	of an absolutely-positioned child of a <a>flex container</a>
@@ -664,21 +665,28 @@ Absolutely-Positioned Flex Children</h3>
 	For this purpose,
 	a value of ''align-self: auto'' is treated identically to ''align-self/start''.
 
-	<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’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>
+		In other words,
+		the <a>static-position rectangle</a> of an absolutely-positioned child of a <a>flex container</a>
+		is the <a>flex container's</a> content box,
+		where 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”
+
+		(In block layout the static position rectangle corresponds to the position of the “hypothetical box”
 		described in <a href="https://www.w3.org/TR/CSS2/visudet.html#abs-non-replaced-width">CSS2.1&sect;10.3.7</a>.
-		(Since it has no alignment properties,
+		Since it has no alignment properties,
 		CSS2.1 always uses a <a>block-start</a> <a>inline-start</a> alignment
-		of the absolutely-positioned box within the <a>static-position rectangle</a>.)
-		Note that this definition will eventually move to the CSS Positioning module.
+		of the absolutely-positioned box within the <a>static-position rectangle</a>.
+		Note that this definition will eventually move to the CSS Positioning module.)
+	</div>
+
+	<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>,
+		auto offsets on the child will center it in the <a>flex container's</a> <a>cross axis</a>.
+
+		However, since the absolutely-positioned box is considered to be “fixed-size”,
+		a value of ''align-self/stretch'' is treated the same as ''align-self/flex-start''.
 	</div>
 
 <h3 id='item-margins'>
@@ -3472,6 +3480,8 @@ Clarifications</h4>
 					In general, the <a>automatic minimum size</a> &hellip; defined below:
 				</p></ins>
 			</blockquote>
+		<li id="change-2016-clarify-staticpos">
+			Slightly reworded the section on determining the static position of absolutely-positioned children to be clearer.
 		<li>Miscellaneous trivial editorial improvements.
 	</ul>