[css-values-5][editorial] markup fixes

Author: tabatkins

css-values-5/Overview.bs

@@ -224,7 +224,7 @@ Boolean Expression Multiplier <<boolean-expr[]>></h3>
 	specify conditions,
 	and allow combining those conditions with boolean logic (and/or/not/grouping).
 	Because they use the same non-trivial recursive syntax structure,
-	the special <dfn type><<boolean-expr[]>></dfn> production represents this pattern generically.
+	the special <dfn type><<boolean-expr>></dfn> production represents this pattern generically.
 
 	The <<boolean-expr[]>> notation wraps another value type in the square brackets within it,
 	e.g. &lt;boolean[ &lt;test&gt; ]&gt;,
@@ -376,7 +376,7 @@ since parse results might be ambiguous
 and need further massaging.
 
 To avoid these issues and get a well-defined result,
-use [=parse with a &lt;syntax>=]:
+use [=parse with a <syntax>=]:
 
 <div algorithm>
 	To <dfn export>parse with a <<syntax>></dfn>
@@ -419,7 +419,7 @@ the invoking algorithm will need to handle that on its own.
 
 
 <h2 id="level-4-extensions">
-Extensions to Level 4 Value Types</h3>
+Extensions to Level 4 Value Types</h2>
 
 	See <a href="https://www.w3.org/TR/css-values-4/">CSS Values and Units Level 4</a>.
 
@@ -632,7 +632,7 @@ Request URL Modifiers</h4>
 					<figcaption>
 					    Diagram of the meaning of ''background-position: 75% 50%''.
 					</figcaption>
-				</div>
+				</figure>
 			</div>
 
 		<dt><dfn>top</dfn>
@@ -652,7 +652,7 @@ Request URL Modifiers</h4>
 		<dd>
 			Computes the same as the physical edge keyword
 			corresponding to the [=start=]/[=end=] side
-			in the [=y-axis|y/[=x-axis|x=] axis.
+			in the [=y-axis|y=]/[=x-axis|x=] axis.
 
 		<dt><dfn>block-start</dfn>
 		<dt><dfn>block-end</dfn>
@@ -947,7 +947,7 @@ Mixing and Interpolation Notations: the *-mix() family</h2>
 	These [=functional notations=] follow the syntactic pattern:
 
 	<pre class=prod>
-		<var>mix-function</var>() = <var>mix-function</var>( <<progress>>, [=mix start value|start-value=], [=mix end value|end-value=] )
+		<var>mix-function</var>() = <var>mix-function</var>( <<progress>>, <l>[=mix start value|start-value=]</l>, <l>[=mix end value|end-value=]</l> )
 	</pre>
 
 	The [=mix notations=] in CSS include:
@@ -1645,7 +1645,7 @@ Ian's proposal:
 	and those functions are syntactically valid,
 	the entire property's grammar must be assumed to be valid at parse time.
 	It is only syntax-checked at computed-value time,
-	after ''attr()'' functions have been [=substitute an attr()|substituted=].
+	after ''attr()'' functions have been [=arbitrary substitution|substituted=].
 
 	<div class='note'>
 		Note that the default value need not be of the type given.
@@ -1717,7 +1717,7 @@ Attribute Value Substitution: the ''attr()'' notation</h4>
 
 			Note: No parsing or modification of any kind is performed on the value.
 
-		4. [=Parse with a &lt;syntax>=] |attr value|, with |syntax| and |el|.
+		4. [=Parse with a <syntax>=] |attr value|, with |syntax| and |el|.
 			Return the result and |fallback|.
 	</div>
 
@@ -1800,7 +1800,7 @@ Cycles</h4>
 
 An attribute value may contain ''attr()'' functions,
 or other [=arbitrary substitution functions=],
-that are substituted during [=parse with a &lt;syntax>=].
+that are substituted during [=parse with a <syntax>=].
 This can cause cyclic dependecies,
 either by an attribute referring to itself,
 through multiple attributes referring to each other,
@@ -1877,7 +1877,7 @@ Constructing <<custom-ident>> values: the ''ident()'' function</h3>
 	and can be used to manually construct <<custom-ident>> values from several parts.
 
 	<pre class=prod>
-	<dfn function lt="ident()"><<ident()>></dfn> = ident( <<ident-arg>>+ )
+	<<ident()>> = ident( <<ident-arg>>+ )
 	<dfn><<ident-arg>></dfn> = <<string>> | <<integer>> | <<ident>>
 	</pre>
 
@@ -2448,7 +2448,7 @@ Tree Counting Functions: the ''sibling-count()'' and ''sibling-index()'' notatio
 	operate on the [=flat tree=].
 
 	Note: These functions may, in the future,
-	be extended to accept an ''of <<selector>>'' argument,
+	be extended to accept an ''of <<complex-real-selector-list>>'' argument,
 	similar to '':nth-child()'',
 	to filter on a subset of the children.