[css-text-3] Tighten up applicability / wording of . Fixes w3c#2545

Author: fantasai

css-text-4/Overview.bs

@@ -174,7 +174,7 @@ Text Wrap Settings: the 'text-wrap' property</h3>
 	Name: text-wrap
 	Value: wrap | nowrap | balance | multi-line
 	Initial: wrap
-	Applies to: all elements
+	Applies to: <a>inline boxes</a> and <a>block containers</a>
 	Inherited: yes
 	Percentages: n/a
 	Computed value: as specified
@@ -186,8 +186,10 @@ Text Wrap Settings: the 'text-wrap' property</h3>
 	<dl dfn-for=text-wrap dfn-type=value>
 		<dt><dfn>wrap</dfn>
 		<dd>
-			Lines may break at allowed break points,
-			as determined by the line-breaking rules in effect.
+			Specifies that inline-level content may break across lines
+			at allowed <a>soft wrap opportunities</a>,
+			as determined by the line-breaking rules in effect
+			in order to minimize <a>inline-axis</a> overflow.
 			Line breaking behavior defined
 			for the WJ, ZW, and GL line-breaking classes
 			in [[!UAX14]] must be honored.
@@ -198,14 +200,14 @@ Text Wrap Settings: the 'text-wrap' property</h3>
 
 		<dt><dfn>nowrap</dfn>
 		<dd>
-			Lines may not break; text that does not fit within the block container
-			overflows it.
+			Specifies that inline-level content must not break across lines;
+			content that does not fit within the block container overflows it.
 
 		<dt><dfn>balance</dfn>
 		<dd>
-			Same as ''text-wrap/wrap'' for inline-level elements.
-			For block-level elements that
-			contain line boxes as direct children,
+			Same as ''text-wrap/wrap'' for <a>inline boxes</a>.
+			For <a>block containers</a> that
+			establish an <a>inline formatting context</a>,
 			line breaks are chosen to balance
 			the remaining (empty) space in each line box,
 			if better balance than ''text-wrap/wrap'' is possible.
@@ -227,7 +229,7 @@ Text Wrap Settings: the 'text-wrap' property</h3>
 
 		<dt><dfn>multi-line</dfn>
 		<dd>
-			Same as ''text-wrap/wrap'' for inline-level elements.
+			Same as ''text-wrap/wrap'' for  <a>inline boxes</a>.
 			Same as ''text-wrap/wrap'' for block-level elements,
 			except as below.