[css-images-4][editorial] fix markup

Author: tabatkins

css-images-4/Overview.bs

@@ -139,13 +139,15 @@ Image References: the ''url()'' notation {#url-notation}
 Fetching External Images {#fetching-images}
 -------------------------------------------
 
-	To <dfn>fetch an external image for a stylesheet</dfn>,
+	To <dfn export>fetch an external image for a stylesheet</dfn>,
 	given a <<url>> |url| and {{CSSStyleSheet}} sheet,
 	[=fetch a style resource=] given |url|,
 	with stylesheet {{CSSStyleSheet}},
 	destination "image",
 	CORS mode "no-cors",
-	and processResponse being the following steps given [=/response=] |res| and null, failure or
+	and processResponse being the following steps
+	given [=/response=] <var ignore>res</var>
+	and null, failure or
 	a byte stream |byteStream|:
 		If |byteStream| is a byte stream, load the image from the byte stream.
 
@@ -1229,7 +1231,7 @@ The effect of colorspace on interpolation can be significant.
 	<!-- source: images/rectangular-f01-081.html -->
 	<img src="images/rectangular-f01-081.png"
 		width="360" height="330"
-		alt="red to green gradient in three colorspaces" />
+		alt="red to green gradient in three colorspaces" >
 </div>
 
 <div class="example">
@@ -1254,7 +1256,7 @@ The effect of colorspace on interpolation can be significant.
 	<!-- source: images/rectangular-fff-01e.html-->
 	<img src="images/rectangular-fff-01e.png"
 		width="360" height="330"
-		alt="white to blue gradient in three colorspaces" />
+		alt="white to blue gradient in three colorspaces" >
 </div>
 
 <div class="example">
@@ -1283,7 +1285,7 @@ The effect of colorspace on interpolation can be significant.
 	<!-- source: images/rectangular-44c-795.html -->
 	<img src="images/rectangular-44c-795.png"
 		width="360" height="330"
-		alt="blue to green gradient in three colorspaces" />
+		alt="blue to green gradient in three colorspaces" >
 </div>
 
 Choosing a polar, rather than rectangular, colorspace
@@ -1318,7 +1320,7 @@ to bring them back into gamut.
 	<!-- source: images/polar-a37-595.html -->
 	<img src="images/polar-a37-595.png"
 		width="360" height="538"
-		alt="blue to green gradient in three colorspaces" />
+		alt="blue to green gradient in three colorspaces" >
 </div>
 
 <!--
@@ -1344,7 +1346,7 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 	<pre class=prod>
 		<dfn>&lt;radial-gradient-syntax></dfn> =
 			[ [ [ <<rg-ending-shape>> || <<rg-size>> ]? [ at <<position>> ]? ] || <<color-interpolation-method>>]? ,
-		  	<<color-stop-list>>
+			<<color-stop-list>>
 	</pre>
 
 <div class="example">
@@ -1367,7 +1369,7 @@ Radial Gradients: the ''radial-gradient()'' notation {#radial-gradients}
 	<!-- source: images/radial-rectangular-f01-081.html -->
 	<img src="images/radial-rectangular-f01-081.png"
 		width="360" height="330"
-		alt="red to green gradient in three colorspaces" />
+		alt="red to green gradient in three colorspaces" >
 </div>
 
 <!--