remove issue about implied types per WG resolution ISSUE-191 <http://lists.w3.org/Archives/Public/www-style/2011Oct/0482.html>; clarify that relative URLs in the document are relative to the document

Author: fantasai

css3-values/Overview.html

@@ -1550,7 +1550,9 @@ <h3 id=attr><span class=secno>8.3. </span> Attribute References: &lsquo;<a
     default is a UA-dependent URI defined to point to a non-existent document
     with a generic error condition. (i.e. it shouldn't be an FTP URI that
     causes a DNS error, or an HTTP URI that results in a 404, it should be a
-    nondescript error condition.)
+    nondescript error condition.) Relative URLs must be made absolute
+    according to the rules of the document language; they are not relative to
+    the style sheet.
 
    <dt>&lsquo;<a href="#integer"><code class=css>integer</code></a>&rsquo;
 
@@ -1635,13 +1637,6 @@ <h3 id=attr><span class=secno>8.3. </span> Attribute References: &lsquo;<a
     relevant units.
   </dl>
 
-  <p class=issue>Ideally, it shouldn't be necessary to specify the type if it
-   is obvious. For example, this should be valid: &lsquo;<code
-   class=css>background-image: attr(href);</code>&rsquo;. This could be
-   described as: "If the property only accepts one type of value (aside from
-   &lsquo;<code class=property>inherit</code>&rsquo; and &lsquo;<code
-   class=property>initial</code>&rsquo;), that type is implied".
-
   <div class=example>
    <p>This example shows the use of attr() to visually illustrate data in an
     XML file:</p>

css3-values/Overview.src.html

@@ -1083,7 +1083,9 @@ <h3 id="attr">
 		to point to a non-existent document with a generic error
 		condition. (i.e. it shouldn't be an FTP URI that causes a DNS
 		error, or an HTTP URI that results in a 404, it should be a
-		nondescript error condition.)
+		nondescript error condition.) Relative URLs must be made absolute
+		according to the rules of the document language; they are not
+		relative to the style sheet.
 
 		<dt>''integer''
 		<dd>The attribute value will be interpreted as a CSS ''&lt;integer>''.
@@ -1135,12 +1137,6 @@ <h3 id="attr">
 		units.
 	</dl>
 
-	<p class="issue">Ideally, it shouldn't be necessary to specify the
-	type if it is obvious. For example, this should be valid:
-	''background-image: attr(href);''. This could be described as:
-	"If the property only accepts one type of value (aside from
-	'inherit' and 'initial'), that type is implied".</p>
-
 	<div class="example">
 		<p>This example shows the use of attr() to visually illustrate data 
 		in an XML file:</p>