Use the term 'inclusive siblings' to make it :nth-child/etc less ambiguous.

Author: tabatkins

selectors/Overview.bs

@@ -2568,7 +2568,7 @@ Tree-Structural pseudo-classes</h2>
 Child-indexed Pseudo-classes</h3>
 
 	The pseudo-classes defined in this section select elements
-	based on their index in their list of siblings.
+	based on their index amongst their <a>inclusive siblings</a>.
 
 	Note: Selectors 3 described these selectors as selecting elements based on their index in the child list of their parents.
 	(This description survives in the name of this very section, and the names of several of the pseudo-classes.)
@@ -2582,7 +2582,7 @@ Child-indexed Pseudo-classes</h3>
 	The <dfn id='nth-child-pseudo' lt=":nth-child()">:nth-child(<var>An+B</var> [of <var>S</var>]? )</dfn>
 	pseudo-class notation represents the <var>An+B</var>th element
 	which matches the <a>selector list</a> <var>S</var>
-	among its siblings.
+	among its <a>inclusive siblings</a>.
 
 	The CSS Syntax Module [[!CSS3SYN]] defines the <a href="http://dev.w3.org/csswg/css-syntax/#anb"><var>An+B</var> notation</a>.
 	If <var>S</var> is omitted,
@@ -2658,7 +2658,7 @@ Child-indexed Pseudo-classes</h3>
 	The <dfn id='nth-last-child-pseudo' lt=":nth-last-child()">:nth-last-child(<var>An+B</var> [of <var>S</var>]? )</dfn>
 	pseudo-class notation represents the <var>An+B</var>th element
 	which matches the <a>selector list</a> <var>S</var>
-	among its siblings,
+	among its <a>inclusive siblings</a>,
 	counting backwards from the end.
 
 	The CSS Syntax Module [[!CSS3SYN]] defines the <a href="http://dev.w3.org/csswg/css-syntax/#anb"><var>An+B</var> notation</a>.
@@ -2680,7 +2680,7 @@ Child-indexed Pseudo-classes</h3>
 '':first-child'' pseudo-class</h4>
 
 	The <dfn id='first-child-pseudo'>:first-child</dfn> pseudo-class
-	represents an element that precedes all of its siblings (if any).
+	represents an element that if first among its <a>inclusive siblings</a>.
 	Same as '':nth-child(1)''.
 
 	<div class="example">
@@ -2722,7 +2722,7 @@ Child-indexed Pseudo-classes</h3>
 '':last-child'' pseudo-class</h4>
 
 	The <dfn id='last-child-pseudo'>:last-child</dfn> pseudo-class
-	represents an element that follows all of its siblings (if any).
+	represents an element that is last among its <a>inclusive siblings</a>.
 	Same as '':nth-last-child(1)''.
 
 	<div class="example">
@@ -2755,7 +2755,7 @@ Typed Child-indexed Pseudo-classes</h3>
 	The <dfn id='nth-of-type-pseudo' lt=":nth-of-type()">:nth-of-type(<var>An+B</var>)</dfn> pseudo-class notation
 	represents the <var>An+B</var>th element
 	with the same <a section href="#type-nmsp">namespace</a> and <a section href="#type-selectors">type</a>
-	among its siblings.
+	among its <a>inclusive siblings</a>.
 
 	The CSS Syntax Module [[!CSS3SYN]] defines the <a href="http://dev.w3.org/csswg/css-syntax/#anb"><var>An+B</var> notation</a>.
 
@@ -2781,7 +2781,7 @@ Typed Child-indexed Pseudo-classes</h3>
 	The <dfn id='nth-last-of-type' lt=":nth-last-of-type()">:nth-last-of-type(<var>An+B</var>)</dfn> pseudo-class notation
 	represents the <var>An+B</var>th element
 	with the same <a section href="#type-nmsp">namespace</a> and <a section href="#type-selectors">type</a>
-	among its siblings,
+	among its <a>inclusive siblings</a>,
 	counting backwards from the end.
 
 	The CSS Syntax Module [[!CSS3SYN]] defines the <a href="http://dev.w3.org/csswg/css-syntax/#anb"><var>An+B</var> notation</a>.
@@ -2804,9 +2804,9 @@ Typed Child-indexed Pseudo-classes</h3>
 '':first-of-type'' pseudo-class</h4>
 
 	The <dfn id='first-of-type-pseudo'>:first-of-type</dfn> pseudo-class
-	represents an element that is the first sibling
+	represents an element that is the first
 	with a particular <a section href="#type-nmsp">namespace</a> and <a section href="#type-selectors">type</a>
-	among its siblings.
+	among its <a>inclusive siblings</a>.
 	Same as '':nth-of-type(1)''.
 
 	<div class="example">
@@ -2840,9 +2840,9 @@ Typed Child-indexed Pseudo-classes</h3>
 '':last-of-type'' pseudo-class</h4>
 
 	The <dfn id='last-of-type-pseudo'>:last-of-type</dfn> pseudo-class
-	represents an element that is the first sibling
+	represents an element that is the first
 	with a particular <a section href="#type-nmsp">namespace</a> and <a section href="#type-selectors">type</a>
-	among its siblings,
+	among its <a>inclusive siblings</a>,
 	counting backwards from the end.
 	Same as '':nth-last-of-type(1)''.