[css-values] Define all the units properly, so they'll link as expected.

Author: tabatkins

css-values/Overview.bs

@@ -826,7 +826,7 @@ Font-relative lengths: the ''em'', ''ex'', ''ch'', ''rem'' units</h4>
 	(or the computed font metrics corresponding to the initial values of the 'font' property,
 	if the element has no parent).
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<length>">
 		<dt><dfn lt="em">em unit</dfn>
 		<dd>
 			Equal to the computed value of the 'font-size' property of the element on which it is used.
@@ -864,7 +864,7 @@ Font-relative lengths: the ''em'', ''ex'', ''ch'', ''rem'' units</h4>
 		<dd>
 			Equal to the used <a>advance measure</a> of the "0" (ZERO, U+0030) glyph
 			found in the font used to render it.
-			(The <dfn>advance measure</dfn> of a glyph is its advance width or height,
+			(The <dfn dfn>advance measure</dfn> of a glyph is its advance width or height,
 			whichever is in the inline axis of the element.)
 
 			Note: The advance measure of a glyph depends on writing-mode and text-orientation
@@ -908,7 +908,7 @@ Viewport-percentage lengths: the ''vw'', ''vh'', ''vmin'', ''vmax'' units</h4>
 	For paged media, the exact definition of the viewport-percentage lengths
 	is deferred to [[!CSS3PAGE]].
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<length>">
 		<dt><dfn lt="vw">vw unit</dfn>
 		<dd>
 			Equal to 1% of the width of the initial containing block.
@@ -959,7 +959,7 @@ Absolute lengths: the ''cm'', ''mm'', ''q'', ''in'', ''pt'', ''pc'', ''px'' unit
 		<tr><th>unit
 		    <th>name
 		    <th>equivalence
-	<tbody>
+	<tbody dfn-type=value dfn-for="<length>">
 		<tr><th><dfn>cm</dfn>
 		    <td>centimeters
 		    <td>1cm = 96px/2.54
@@ -998,7 +998,7 @@ Absolute lengths: the ''cm'', ''mm'', ''q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	For a CSS device, these dimensions are anchored either
 	<ul>
 		<li>(i) by relating the <a>physical units</a> to their physical measurements, or
-		<li>(ii) by relating the <a>pixel unit</a> to the <a>reference pixel</a>.
+		<li>(ii) by relating the <a value>pixel unit</a> to the <a>reference pixel</a>.
 	</ul>
 
 	For print media and similar high-resolution devices,
@@ -1093,7 +1093,7 @@ Angle Units: the <<angle>> type and ''deg'', ''grad'', ''rad'', ''turn'' units</
 	(i.e. can be syntactically represented as the <a>number</a> ''0'').
 	The angle unit identifiers are:
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<angle>">
 		<dt><dfn>deg</dfn>
 		<dd>
 			Degrees. There are 360 degrees in a full circle.
@@ -1144,7 +1144,7 @@ Duration Units: the <<time>> type and ''s'', ''ms'' units</h3>
 	Time values are <a>dimensions</a> denoted by <dfn id="time-value">&lt;time></dfn>.
 	The time unit identifiers are:
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<time>">
 		<dt><dfn>s</dfn>
 		<dd>Seconds.
 		<dt><dfn>ms</dfn>
@@ -1171,7 +1171,7 @@ Frequency Units: the <<frequency>> type and ''Hz'', ''kHz'' units</h3>
 	Frequency values are <a>dimensions</a> denoted by <dfn id="frequency-value">&lt;frequency></dfn>.
 	The frequency unit identifiers are:
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<frequency>">
 	  <dt><dfn>Hz</dfn>
 	  <dd>Hertz. It represents the number of occurrences per second.
 	  <dt><dfn>kHz</dfn>
@@ -1197,7 +1197,7 @@ Resolution Units: the <<resolution>> type and ''dpi'', ''dpcm'', ''dppx'' units<
 	Resolution units are <a>dimensions</a> denoted by <dfn id="resolution-value">&lt;resolution></dfn>.
 	The resolution unit identifiers are:
 
-	<dl export>
+	<dl export dfn-type=value dfn-for="<frequency>">
 		<dt><dfn>dpi</dfn>
 		<dd>Dots per inch.