[css-ui][editorial] Markup <x> and <y> productions with <dfn> element

Author: cdoublev

css-ui-4/Overview.bs

@@ -683,7 +683,7 @@ Styling the Cursor: the 'cursor' property</h4>
 
 	<pre class="propdef">
 	Name: cursor
-	Value: [ [ <<url>> | <<url-set>> ] [&lt;x&gt; &lt;y&gt;]? ]#? <br>
+	Value: [ [ <<url>> | <<url-set>> ] [<<x>> <<y>>]? ]#? <br>
 	 [ auto | default | none |<br>
 	 context-menu | help | pointer | progress | wait | <br>
 	 cell | crosshair | text | vertical-text | <br>
@@ -827,8 +827,8 @@ Styling the Cursor: the 'cursor' property</h4>
 					The optional &lt;x&gt; and &lt;y&gt; coordinates
 					identify the exact position within the image which is the pointer position (i.e., the hotspot).
 
-				<dt>&lt;x&gt;
-				<dt>&lt;y&gt;
+				<dt><dfn><<x>></dfn>
+				<dt><dfn><<y>></dfn>
 				<dd>
 					Each is a <<number>>.
 					The x-coordinate and y-coordinate of the position