Add <position> as a basic data type. Also clarify for <image> and <color> that future levels of their specs should be consulted as they exist.

Author: tabatkins

css3-values/Overview.html

@@ -254,6 +254,9 @@ <h2 class="no-num no-toc" id=contents>Table of contents</h2>
 
      <li><a href="#images"><span class=secno>7.2. </span> Images: the
       &lsquo;<code class=css>&lt;image&gt;</code>&rsquo; type</a>
+
+     <li><a href="#images"><span class=secno>7.3. </span> 2D Positioning: the
+      &lsquo;<code class=css>&lt;position&gt;</code>&rsquo; type</a>
     </ul>
 
    <li><a href="#functional-notation"><span class=secno>8. </span> Functional
@@ -1189,7 +1192,7 @@ <h3 id=colors><span class=secno>7.1. </span> Colors: the &lsquo;<a
    <a href="#CSS21" rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a> and <a
    href="http://www.w3.org/TR/css3-color/#colorunits">extended</a> in <a
    href="#CSS3COLOR" rel=biblioentry>[CSS3COLOR]<!--{{!CSS3COLOR}}--></a>.
-   UAs that support CSS Color Level 3 must interpret <a
+   UAs that support CSS Color Level 3 or its successor must interpret <a
    href="#color-value"><code>&lt;color&gt;</code></a> as defined therein.
 
   <h3 id=images><span class=secno>7.2. </span> Images: the &lsquo;<a
@@ -1201,9 +1204,24 @@ <h3 id=images><span class=secno>7.2. </span> Images: the &lsquo;<a
    href="http://www.w3.org/TR/css3-images/#image">extended</a> in <a
    href="#CSS3-IMAGES"
    rel=biblioentry>[CSS3-IMAGES]<!--{{!CSS3-IMAGES}}--></a>: UAs that support
-   CSS Image Values Level 3 must interpret <a
+   CSS Image Values Level 3 or its successor must interpret <a
    href="#image-value"><code>&lt;image&gt;</code></a> as defined therein.
 
+  <h3 id=images><span class=secno>7.3. </span> 2D Positioning: the &lsquo;<a
+   href="#position-value"><code class=css>&lt;position&gt;</code></a>&rsquo;
+   type</h3>
+
+  <p>The <dfn id=position-value><code>&lt;position&gt;</code></dfn> data type
+   is defined herein as equivalent to the <a
+   href="http://www.w3.org/TR/CSS21/colors.html#propdef-background-position"><code>&lt;'background-position'&gt;</code></a>
+   syntax defined in <a href="#CSS21"
+   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>. It is <a
+   href="http://www.w3.org/TR/css3-background/#the-background-position">extended</a>
+   in <a href="#CSS3BG" rel=biblioentry>[CSS3BG]<!--{{!CSS3BG}}--></a>: UAs
+   that support CSS Backgrounds &amp; Borders Level 3 or its successor must
+   interpret <a href="#position-value"><code>&lt;position&gt;</code></a> as
+   defined therein.
+
   <h2 id=functional-notation><span class=secno>8. </span> Functional
    Notations</h2>
 
@@ -1735,6 +1753,16 @@ <h3 class=no-num id=normative-references>Normative references</h3>
     </dd>
    <!---->
 
+   <dt id=CSS3BG>[CSS3BG]
+
+   <dd>Bert Bos; Elika J. Etemad; Brad Kemper. <a
+    href="http://www.w3.org/TR/2011/CR-css3-background-20110215"><cite>CSS
+    Backgrounds and Borders Module Level 3.</cite></a> 15 February 2011. W3C
+    Candidate Recommendation. (Work in progress.) URL: <a
+    href="http://www.w3.org/TR/2011/CR-css3-background-20110215">http://www.w3.org/TR/2011/CR-css3-background-20110215</a>
+    </dd>
+   <!---->
+
    <dt id=CSS3COLOR>[CSS3COLOR]
 
    <dd>Tantek &#199;elik; Chris Lilley; L. David Baron. <a
@@ -1858,6 +1886,10 @@ <h2 class=no-num id=index>Index</h2>
     href="#percentage-value"
     title="&lt;percentage&gt;"><strong>4.2.</strong></a>
 
+   <li><a href="#position-value"><code>&lt;position&gt;</code></a>, <a
+    href="#position-value" title="&lt;position&gt;"><strong>7.3.</strong></a>
+    
+
    <li>rad, <a href="#rad" title=rad><strong>6.1.</strong></a>
 
    <li>reference pixel, <a href="#reference-pixel"

css3-values/Overview.src.html

@@ -798,7 +798,7 @@ <h3 id="colors">
 	<a href="http://www.w3.org/TR/CSS21/syndata.html#color-units">defined</a>
 	in [[!CSS21]] and
 	<a href="http://www.w3.org/TR/css3-color/#colorunits">extended</a> in [[!CSS3COLOR]].
-	UAs that support CSS Color Level 3 must interpret <code>&lt;color&gt;</code>
+	UAs that support CSS Color Level 3 or its successor must interpret <code>&lt;color&gt;</code>
 	as defined therein.
 
 <h3 id="images">
@@ -807,9 +807,18 @@ <h3 id="images">
 	<p>The <dfn id="image-value"><code>&lt;image&gt;</code></dfn> data type is
 	defined herein as equivalent to <code>&lt;url&gt;</code>.
 	It is <a href="http://www.w3.org/TR/css3-images/#image">extended</a> in
-	[[!CSS3-IMAGES]]: UAs that support CSS Image Values Level 3 must interpret
+	[[!CSS3-IMAGES]]: UAs that support CSS Image Values Level 3 or its successor must interpret
 	<code>&lt;image&gt;</code> as defined therein.
 
+<h3 id="images">
+2D Positioning: the ''&lt;position&gt;'' type</h3>
+
+	<p>The <dfn id="position-value"><code>&lt;position&gt;</code></dfn> data type is
+	defined herein as equivalent to the <a href="http://www.w3.org/TR/CSS21/colors.html#propdef-background-position"><code>&lt;'background-position'&gt;</code></a> syntax defined in [[!CSS21]].
+	It is <a href="http://www.w3.org/TR/css3-background/#the-background-position">extended</a> in
+	[[!CSS3BG]]: UAs that support CSS Backgrounds &amp; Borders Level 3 or its successor must interpret
+	<code>&lt;position&gt;</code> as defined therein.
+
 <h2 id="functional-notation">
 Functional Notations</h2>