[css-syntax] Clarify non-normative-ness of several sections and links, so the Normative References chapter is correct and minimal.

Author: tabatkins

css-syntax-3/Overview.bs

@@ -399,7 +399,7 @@ The input byte stream</h3>
 
 	Note: [[CSSOM]] defines <a href="https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction">the environment encoding for <code>&lt;xml-stylesheet?></code></a>.
 
-	Note: [[CSS-CASCADE-3]] defines <a href="https://drafts.csswg.org/css-cascade/#at-ruledef-import">the environment encoding for <code>@import</code></a>.
+	Note: [[CSS-CASCADE-3]] defines <a at-rule lt=@import>the environment encoding for <code>@import</code></a>.
 
 
 <h3 id="input-preprocessing">
@@ -1996,7 +1996,7 @@ Parse something according to a CSS grammar</h4>
 	If it is meant to be exposed outside of spec language,
 	the spec using the result must explicitly translate it into a well-specified representation,
 	such as, for example, by invoking a CSS serialization algorithm
-	(like "serialize as a CSS <<string>> value").
+	<span class=informative>(like "serialize as a CSS <<string>> value").</span>
 
 	To <dfn export lt="parse something according to a CSS grammar|parse" for=CSS>parse something according to a CSS grammar</dfn>:
 
@@ -2539,7 +2539,7 @@ Consume a function</h4>
 The <var>An+B</var> microsyntax</h2>
 
 	Several things in CSS,
-	such as the '':nth-child()'' pseudoclass,
+	such as the <span class=informative>'':nth-child()''</span> pseudoclass,
 	need to indicate indexes in a list.
 	The <var>An+B</var> microsyntax is useful for this,
 	allowing an author to easily indicate single elements
@@ -2784,7 +2784,7 @@ The <code>&lt;an+b></code> type</h3>
 The Unicode-Range microsyntax</h2>
 
 	Some constructs,
-	<span class="informative">such as the 'unicode-range' descriptor for the ''@font-face'' rule</span>,
+	<span class=informative>such as the 'unicode-range' descriptor for the ''@font-face'' rule,</span>
 	need a way to describe one or more unicode code points.
 	The <dfn>&lt;urange></dfn> production represents a range of one or more unicode code points.
 
@@ -3131,12 +3131,12 @@ Defining Arbitrary Contents: the <<declaration-value>> and <<any-value>> product
 	(rather than simply invalidating the construct,
 	as grammar mismatches tend to do).
 
-	For example, <a>custom properties</a> allow any reasonable value,
+	<span class=informative>For example, <a>custom properties</a> allow any reasonable value,
 	as they can contain arbitrary pieces of other CSS properties,
 	or be used for things that aren't part of existing CSS at all.
 	For another example, the <<general-enclosed>> production in Media Queries
 	defines the bounds of what future syntax MQs will allow,
-	and uses special logic to deal with "unknown" values.
+	and uses special logic to deal with "unknown" values.</span>
 
 	To aid in this, two additional productions are defined:
 
@@ -3179,11 +3179,11 @@ CSS stylesheets</h2>
 Style rules</h3>
 
 	A <dfn export>style rule</dfn> is a <a>qualified rule</a>
-	that associates a <a>selector list</a> [[!SELECT]]
+	that associates a <a>selector list</a>
 	with a list of property declarations.
 	They are also called
 	<a href="https://www.w3.org/TR/CSS2/syndata.html#rule-sets">rule sets</a> in [[!CSS2]].
-	CSS Cascading and Inheritance [[!CSS-CASCADE-3]] defines how the declarations inside of style rules participate in the cascade.
+	CSS Cascading and Inheritance [[CSS-CASCADE-3]] defines how the declarations inside of style rules participate in the cascade.
 
 	The prelude of the qualified rule is [=CSS/parsed=]
 	as a <<selector-list>>.
@@ -3410,7 +3410,7 @@ Privacy and Security Considerations</h2>
  ██████  ██     ██ ██     ██ ██    ██  ██████   ████████  ██████
 -->
 
-<h2 id="changes">
+<h2 id="changes" class=non-normative>
 Changes</h2>
 
 	<em>This section is non-normative.</em>