[selectors-4] Move some paragraphs around. (No actual changes.)

Author: fantasai

selectors/Overview.bs

@@ -501,45 +501,9 @@ Selector Syntax and Structure</h2>
 <h3 id="structure">
 Structure and Terminology</h3>
 
-	The <dfn export local-lt="subject">subject of a selector</dfn> is
-	the element(s) that selector is defined to be about:
-
-	<ul>
-		<li>For a <a>simple selector</a>, it is any element represented by that selector.
-		<li>For a <a>compound selector</a>, it is any element that matches all of its composite <a>simple selectors</a>.
-		<li>For a <a>complex selector</a>, it is any element that matches the last <a>compound selector</a> in the selector.
-		<li>For a <a>selector list</a>, it is any any element that matches the any of the <a>selectors</a> in the list.
-	</ul>
-
-	An element is said to <dfn export>match</dfn> a selector
-	if it is a <a>subject</a> of that selector.
-	Thus a selector consisting of a single <a>compound selector</a>
-	matches any element satisfying its requirements.
-	Prepending another <a>compound selector</a> and a <a>combinator</a>
-	to a sequence imposes additional matching constraints,
-	so the <a>subjects</a> of a <a>complex selector</a> are always a subset of
-	the elements represented by its last <a>compound selector</a>.
-
-	Issue: Can we make this less wishy-washy by saying that a complex selector “represents” its last compound selector?
-	Or do we need to have ''a + b'' “represent” both an "a" and a "b" in a sibling relationship?
-
 	The term <a>selector</a> can refer to a <a>simple selector</a>,
 	<a>compound selector</a>, <a>complex selector</a>, or <a>selector list</a>.
 
-	A <dfn export>selector list</dfn> is a comma-separated list of <a>selectors</a>;
-	see <a href="#grouping">Selector Lists</a>.
-
-	A <dfn id="complex" export>complex selector</dfn> is a sequence of one or more <a>compound selectors</a>
-	separated by <a>combinators</a>.
-
-	A <dfn id="compound" export>compound selector</dfn>
-	is a sequence of <a>simple selectors</a>
-	that are not separated by a <a>combinator</a>.
-	It represents an element that matches all of the <a>simple selectors</a> it contains.
-	If it contains a <a>type selector</a> or <a>universal selector</a>,
-	that selector must come first in the sequence.
-	Only one type selector or universal selector is allowed in the sequence.
-
 	A <dfn id="simple" export>simple selector</dfn>
 	represents an element matched by a particular aspect.
 	A <a>type selector</a>,
@@ -550,6 +514,21 @@ Structure and Terminology</h3>
 	or <a>pseudo-class</a>
 	is a <a>simple selector</a>.
 
+	A <dfn id="compound" export>compound selector</dfn>
+	is a sequence of <a>simple selectors</a>
+	that are not separated by a <a>combinator</a>.
+	It represents an element that matches all of the <a>simple selectors</a> it contains.
+	If it contains a <a>type selector</a> or <a>universal selector</a>,
+	that selector must come first in the sequence.
+	Only one type selector or universal selector is allowed in the sequence.
+
+	Note: As whitespace is a valid <a>combinator</a>,
+	no whitespace is allowed between the <a>simple selectors</a>
+	in a <a>compound selector</a>.
+
+	A <dfn id="complex" export>complex selector</dfn> is a sequence of one or more <a>compound selectors</a>
+	separated by <a>combinators</a>.
+
 	A <dfn export>combinator</dfn> represents a particular kind of relationship
 	between the elements matched by the <a>compound selectors</a> on either side.
 	Combinators in Selectors level 4 include:
@@ -560,9 +539,30 @@ Structure and Terminology</h3>
 
 	Issue: Fill in more combinators, if necessary.
 
-	Note: As whitespace is a valid <a>combinator</a>,
-	no whitespace is allowed between the <a>simple selectors</a>
-	in a <a>compound selector</a>.
+	A <dfn export>selector list</dfn> is a comma-separated list of <a>selectors</a>;
+	see <a href="#grouping">Selector Lists</a>.
+
+	The <dfn export local-lt="subject">subject of a selector</dfn> is
+	the element(s) that selector is defined to be about:
+
+	<ul>
+		<li>For a <a>simple selector</a>, it is any element represented by that selector.
+		<li>For a <a>compound selector</a>, it is any element that matches all of its composite <a>simple selectors</a>.
+		<li>For a <a>complex selector</a>, it is any element that matches the last <a>compound selector</a> in the selector.
+		<li>For a <a>selector list</a>, it is any any element that matches the any of the <a>selectors</a> in the list.
+	</ul>
+
+	An element is said to <dfn export>match</dfn> a selector
+	if it is a <a>subject</a> of that selector.
+	Thus a selector consisting of a single <a>compound selector</a>
+	matches any element satisfying its requirements.
+	Prepending another <a>compound selector</a> and a <a>combinator</a>
+	to a sequence imposes additional matching constraints,
+	so the <a>subjects</a> of a <a>complex selector</a> are always a subset of
+	the elements represented by its last <a>compound selector</a>.
+
+	Issue: Can we make this less wishy-washy by saying that a complex selector “represents” its last compound selector?
+	Or do we need to have ''a + b'' “represent” both an "a" and a "b" in a sibling relationship?
 
 	Issue: Pseudo-elements aren't handled here, and should be.