empty string range should give ClientRect too

Author: annevk

cssom-view/Overview.html

@@ -592,7 +592,8 @@ <h2 id=the-documentview-interface><span class=secno>6 </span>The <code
    href="#viewport">viewport</a> width, <var title="">y</var> is greather
    than the <a href="#viewport">viewport</a> height, or no insertion point
    indicator would have been inserted, the method <em class=ct>must</em>
-   return <code>null</code>. [<cite><a href="#ref-dom2tr">DOM2TR</a></cite>]
+   return <code>null</code>. [<cite><a href="#ref-dom2tr">DOM2TR</a></cite>]</p>
+  <!-- https://bugs.webkit.org/show_bug.cgi?id=27046 -->
 
   <p class=note>The specifics of hit testing are out of scope of this
    specification and therefore the exact details of <code><a
@@ -1083,7 +1084,7 @@ <h2 id=extensions-to-the-range-interface><span class=secno>9
    title=dom-range-getclientrects><code>getClientRects()</code></dfn> method,
    when invoked, <em class=ct>must</em> return an empty <code><a
    href="#clientrectlist">ClientRectList</a></code> object if the range is
-   empty (if the boundary-points are identical) and otherwise a <code><a
+   not in the document and otherwise a <code><a
    href="#clientrectlist">ClientRectList</a></code> object containing a list
    of <code><a href="#clientrect">ClientRect</a></code> objects in content
    order that matches the following constraints:
@@ -1095,12 +1096,13 @@ <h2 id=extensions-to-the-range-interface><span class=secno>9
     element.
 
    <li>For each <code>Text</code> node selected or partially selected by the
-    range, include a <code><a href="#clientrect">ClientRect</a></code> object
-    (for the part that is selected, not the whole line box). The bounds of
-    these <code><a href="#clientrect">ClientRect</a></code> objects are
-    computed using font metrics; thus, for horizontal writing, the vertical
-    dimension of each box is determined by the font ascent and descent, and
-    the horizontal dimension by the text advance width.
+    range (including when the boundary-points are identical), include a
+    <code><a href="#clientrect">ClientRect</a></code> object (for the part
+    that is selected, not the whole line box). The bounds of these <code><a
+    href="#clientrect">ClientRect</a></code> objects are computed using font
+    metrics; thus, for horizontal writing, the vertical dimension of each box
+    is determined by the font ascent and descent, and the horizontal
+    dimension by the text advance width.
   </ul>
 
   <p>The <dfn id=dom-range-getboundingclientrect

cssom-view/Overview.src.html

@@ -479,6 +479,8 @@ <h2 id="the-documentview-interface">The <code title="">DocumentView</code> Inter
   <span>viewport</span> height, or no insertion point indicator would have
   been inserted, the method <em class="ct">must</em> return
   <code>null</code>. [<cite><span>DOM2TR</span></cite>]</p>
+  
+  <!-- https://bugs.webkit.org/show_bug.cgi?id=27046 -->
 
   <p class="note">The specifics of hit testing are out of scope of this
   specification and therefore the exact details of
@@ -919,24 +921,23 @@ <h2 id="extensions-to-the-range-interface">Extensions to the <code title="">Rang
   <p>The
   <dfn id="dom-range-getclientrects" title="dom-range-getclientrects"><code>getClientRects()</code></dfn>
   method, when invoked, <em class="ct">must</em> return an empty
-  <code>ClientRectList</code> object if the range is empty (if the
-  boundary-points are identical) and otherwise a
-  <code>ClientRectList</code> object containing a list of
+  <code>ClientRectList</code> object if the range is not in the document and
+  otherwise a <code>ClientRectList</code> object containing a list of
   <code>ClientRect</code> objects in content order that matches the
   following constraints:</p>
-  
+
   <ul>
    <li>For each element selected by the range, whose parent is not selected
    by the range, include the border boxes returned by invoking
    <code>getClientRects()</code> on the element.</li>
 
    <li>For each <code>Text</code> node selected or partially selected by the
-   range, include a <code>ClientRect</code> object (for the part that is
-   selected, not the whole line box). The bounds of these
-   <code>ClientRect</code> objects are computed using font metrics; thus,
-   for horizontal writing, the vertical dimension of each box is determined
-   by the font ascent and descent, and the horizontal dimension by the text
-   advance width.</li>
+   range (including when the boundary-points are identical), include a
+   <code>ClientRect</code> object (for the part that is selected, not the
+   whole line box). The bounds of these <code>ClientRect</code> objects are
+   computed using font metrics; thus, for horizontal writing, the vertical
+   dimension of each box is determined by the font ascent and descent, and
+   the horizontal dimension by the text advance width.</li>
   </ul>
 
   <p>The