Clarify that the absolute URLs are compared

Author: fantasai

selectors4/Overview.html

@@ -1713,9 +1713,10 @@ <h3 id=here-pseudo><span class=secno>8.2. </span> The link location
    based on the users current location within a site and to differentiate
    site-internal versus site-external links. The <code>:current</code>
    pseudo-class represents an element that is the source anchor of a
-   hyperlink whose target matches the element's own document URI. The
-   fragment identifier of the document URI is stripped before matching
-   against the link's URI; otherwise all portions of the URI are considered.
+   hyperlink whose target's absolute URI matches the element's own document
+   URI. The fragment identifier of the document URI is stripped before
+   matching against the link's URI; otherwise all portions of the URI are
+   considered.
 
   <div class=example>
    <p>For example, the following rule prevents links targetting the current

selectors4/Overview.src.html

@@ -1257,10 +1257,11 @@ <h3 id="here-pseudo">
     links based on the users current location within a site and to
     differentiate site-internal versus site-external links. The
     <code>:current</code> pseudo-class represents an element that is
-    the source anchor of a hyperlink whose target matches the element's
-    own document URI. The fragment identifier of the document URI
-    is stripped before matching against the link's URI; otherwise all
-    portions of the URI are considered.
+    the source anchor of a hyperlink whose target's absolute URI
+    matches the element's own document URI.
+    The fragment identifier of the document URI is stripped before
+    matching against the link's URI; otherwise all portions of the
+    URI are considered.
 
   <div class="example">
     <p>For example, the following rule prevents links targetting the