[css-images-3][editorial] Bikeshed fixes, round 1

Author: fantasai

css-images-3/Overview.bs

@@ -25,7 +25,6 @@ Ignored Vars: start image, end image
 Include Can I Use Panels: yes
 </pre>
 <pre class=link-defaults>
-spec:svg; type:element; text:feimage
 spec:css-backgrounds-3; type:value; text:center
 </pre>
 
@@ -327,10 +326,12 @@ Linear Gradients: the ''linear-gradient()'' notation {#linear-gradients}
 
 <h4 class='no-toc' id='linear-gradient-syntax'>linear-gradient() syntax</h4>
 
-	The linear gradient syntax is:
+	The <dfn>linear-gradient()</dfn> notation
+	specifies a linear gradient in CSS.
+	Its syntax is as follows:
 
 	<pre class=prod>
-		<dfn>linear-gradient()</dfn> = linear-gradient(
+		<<linear-gradient()>> = linear-gradient(
 			[ <<angle>> | to <<side-or-corner>> ]? ,
 			<<color-stop-list>>
 		)
@@ -487,7 +488,8 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 	they instead emerge from a single point
 	and smoothly spread outward in a circular or elliptical shape.
 
-	A radial gradient is specified by indicating the center of the gradient
+	The <dfn>radial-gradient()</dfn> notation specifies a radial gradient
+	by indicating the center of the gradient
 	(where the 0% ellipse will be)
 	and the size and shape of the <dfn>ending shape</dfn>
 	(the 100% ellipse).
@@ -504,12 +506,12 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 	The radial gradient syntax is:
 
 	<pre class=prod>
-		<dfn>radial-gradient()</dfn> = radial-gradient(
+		<<radial-gradient()>> = radial-gradient(
 		  [ <<ending-shape>> || <<size>> ]? [ at <<position>> ]? ,
 		  <<color-stop-list>>
 		)
-		<dfn><<size>></dfn> = <<extent-keyword>> | <<length [0,∞]>> | <<length-percentage [0,∞]>>{2}
-		<dfn><<extent-keyword>></dfn> = closest-corner | closest-side | farthest-corner | farthest-side
+		<<size>> = <<extent-keyword>> | <<length [0,∞]>> | <<length-percentage [0,∞]>>{2}
+		<<extent-keyword>> = closest-corner | closest-side | farthest-corner | farthest-side
 	</pre>
 
 	<div class=example>
@@ -560,7 +562,7 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 			If the ending-shape is an ellipse,
 			its axises are aligned with the horizontal and vertical axises.
 
-			Both ''circle'' and ''ellipse'' gradients accept the following keywords as their <dfn type for=''>&lt;size></dfn>:
+			Both ''circle'' and ''ellipse'' gradients accept the following <dfn><<extent-keyword>></dfn> values:
 
 			<dl dfn-for="<size>">
 				<dt><dfn>closest-side</dfn>
@@ -594,7 +596,7 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 			the <<size>> may be given explicitly as:
 
 			<dl>
-				<dt><dfn for="<size>">&lt;length [0,∞]></dfn>
+				<dt><dfn for="radial-gradient()">&lt;length [0,∞]></dfn>
 				<dd>
 					Gives the radius of the circle explicitly.
 					Negative values are invalid.
@@ -612,7 +614,7 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 			<<size>> may instead be given explicitly as:
 
 			<dl>
-				<dt><dfn for="<size>"><<length-percentage [0,∞]>>{2}</dfn>
+				<dt><dfn for="radial-gradient()"><<length-percentage [0,∞]>>{2}</dfn>
 				<dd>
 					Gives the size of the ellipse explicitly.
 					The first value represents the horizontal radius,