[css-align] Clarifications to better handle 'normal' behaving as 'stretch'. Fixes #1431.

Author: fantasai

css-align/Overview.bs

@@ -1059,8 +1059,10 @@ Inline/Main-Axis Alignment: the 'justify-self' property</h3>
 				are ignored in favor of alignment as specified here,
 				and the used value of the inset properties are not adjusted to correct for the over-constraint.
 
-				Values other than ''justify-self/stretch'' cause <a href="https://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">non-replaced absolutely-positioned boxes</a>
-				to use <a>fit-content sizing</a> for calculating ''width/auto'' inline sizes.
+				Values other than ''justify-self/stretch'' or ''justify-self/normal''
+				cause <a href="https://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">non-replaced absolutely-positioned boxes</a>
+				to use <a>fit-content sizing</a> for calculating ''width/auto'' sizes
+				in the affected axis.
 
 				Note that ''justify-self/stretch'' <em>does</em> cause replaced absolutely-positioned boxes
 				to fill their containing block
@@ -1231,8 +1233,10 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 				are ignored in favor of alignment as specified here
 				and the used value of the inset properties are not adjusted to correct for the over-constraint.
 
-				Values other than ''align-self/stretch'' cause <a href="https://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height">non-replaced absolutely-positioned boxes</a>
-				to use shrink-to-fit sizing for calculating ''height/auto'' block sizes.
+				Values other than ''justify-self/stretch'' or ''justify-self/normal''
+				cause <a href="https://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-height">non-replaced absolutely-positioned boxes</a>
+				to use <a>fit-content sizing</a> for calculating ''height/auto'' sizes
+				in the affected axis.
 
 				Note that ''justify-self/stretch'' does cause replaced absolutely-positioned boxes
 				to fill their containing block