[css-images] Some replaced elements (such as form controls) have an intrinsic width and height, but no aspect ratio. Fixes w3c#1044. Also linkify some nearby terms.

Author: fantasai

css-images/Overview.bs

@@ -1091,13 +1091,17 @@ Object-Sizing Terminology {#sizing-terms}
 			CSS does not define how the intrinsic dimensions are found in general.
 
 			Raster images are an example of an object with all three intrinsic dimensions.
-			SVG images designed to scale might have only an intrinsic aspect ratio;
-			SVG images can also be created with only an intrinsic width or height.
+			SVG images designed to scale might have only an <a>intrinsic aspect ratio</a>;
+			SVG images can also be created with only an <a>intrinsic width</a> or <a lt="intrinsic height">height</a>.
 			CSS gradients, defined in this specification, are an example of an object with no intrinsic dimensions at all.
 			Another example of this is embedded documents,
 			such as the <code>&lt;iframe></code> element in HTML.
-			An object cannot have only two intrinsic dimensions,
+			In general, images cannot have only two intrinsic dimensions,
 			as any two automatically define the third.
+			However some types of replaced elements,
+			such as form controls,
+			can have an <a>intrinsic width</a> and an <a>intrinsic height</a>,
+			but no <a>intrinsic aspect ratio</a>.
 
 			If an object (such as an icon) has multiple sizes,
 			then the largest size (by area) is taken as its intrinsic size.
@@ -1107,8 +1111,7 @@ Object-Sizing Terminology {#sizing-terms}
 			Determine this by seeing which aspect ratio produces the largest area
 			when fitting it within the <a>default object size</a> using a <a>contain constraint</a> fit;
 			if multiple sizes tie for the largest area,
-			the wider size is chosen as its intrinsic size.
-
+			the widest size is chosen as its intrinsic size.
 
 		<dt><dfn>specified size</dfn>
 		<dd>