[css-text-decor-3] Add example for strikethrough averaging.

Author: fantasai

css-text-decor-3/Overview.html

@@ -156,12 +156,12 @@ <h2 class="no-num no-toc" id=status>Status of this document</h2>
    <li>the ‘<a href="#text-decoration-skip"><code
     class=property>text-decoration-skip</code></a>’ property / ‘<code
     class=css>ink</code>’ value
+
+   <li>the <a href="#line-position">line positioning rules</a>
   </ul>
 
-  <p>This is technically the first public working draft of this module,
-   however it is merely an extract from the <a
-   href="http://www.w3.org/TR/2012/WD-css3-text-20120814/">previous Working
-   Draft of CSS Text Level 3</a>.
+  <p>This is a <strong>Last Call Working Draft</strong>. The deadline for
+   comments is <strong>31 January 2013</strong>.
 
   <h2 class="no-num no-toc" id=contents> Table of Contents</h2>
   <!--begin-toc-->
@@ -277,7 +277,7 @@ <h2 class="no-num no-toc" id=contents> Table of Contents</h2>
 
   <h2 id=intro><span class=secno>1. </span> Introduction</h2>
 
-  <p><em>This subsection is informative.</em>
+  <p><em>This subsection is non-normative.</em>
 
   <p>This module covers text decoration, i.e. decorating the glyphs of the
    text once typeset according to font and typographic rules. (See <a
@@ -1033,8 +1033,9 @@ <h3 id=line-position><span class=secno>2.7. </span> Determining the
     decorated fragment at that fragment's ideal position. (Essentially, this
     performs the same sort of averaging as for alphabetic underlines, but
     recomputes the position when drawing across a descendant with a different
-    computed ‘<code class=property>font-size</code>’.) <span
-    class=issue>Need an example here</span>
+    computed ‘<code class=property>font-size</code>’. This ensures that
+    the text remains effectively "crossed out" despite any font size
+    changes.)
   </dl>
 
   <p> CSS does not define the thickness of line decorations. In determining
@@ -1052,6 +1053,15 @@ <h3 id=line-position><span class=secno>2.7. </span> Determining the
    <p>In the three fragments of underlined text, the underline is drawn
     consecutively lower and thicker as the ratio of large text to small text
     increases.
+
+   <p>Using the same example, a line-through would in the second fragment,
+    instead of averaging the two font sizes, split the line-through into two
+    segments:
+
+   <p><img alt="" src=linethrough-averaging.gif>
+
+   <p>In both cases, however, the superscript, due to the vertical-alignment
+    shift, has no effect on the position of the line.
   </div>
 
   <div class=note>

css-text-decor-3/Overview.src.html

@@ -107,11 +107,11 @@ <h2 class="no-num no-toc" id="status">Status of this document</h2>
     its CR period if there are no (correct) implementations:</p>
     <ul>
       <li>the 'text-decoration-skip' property / ''ink'' value
+      <li>the <a href="#line-position">line positioning rules</a>
     </ul>
-
-  <p>This is technically the first public working draft of this module,
-  however it is merely an extract from the
-  <a href="http://www.w3.org/TR/2012/WD-css3-text-20120814/">previous Working Draft of CSS Text Level 3</a>.
+    
+    <p>This is a <strong>Last Call Working Draft</strong>.
+    The deadline for comments is <strong>31 January 2013</strong>.
 
 <h2 class="no-num no-toc" id="contents">
 Table of Contents</h2>
@@ -687,8 +687,8 @@ <h3 id="line-position">
       assigning any fragment with non-initial 'vertical-align' the ideal position of its parent.
       Position the portion of the line across each decorated fragment at that fragment's ideal position.
       (Essentially, this performs the same sort of averaging as for alphabetic underlines,
-      but recomputes the position when drawing across a descendant with a different computed 'font-size'.)
-      <span class="issue">Need an example here</span>
+      but recomputes the position when drawing across a descendant with a different computed 'font-size'.
+      This ensures that the text remains effectively "crossed out" despite any font size changes.)
   </dl>
 
   <p>
@@ -708,6 +708,12 @@ <h3 id="line-position">
     <p>In the three fragments of underlined text, the underline is drawn
       consecutively lower and thicker as the ratio of large text to small
       text increases.</p>
+    <p>Using the same example, a line-through would in the second fragment,
+    instead of averaging the two font sizes,
+    split the line-through into two segments:
+    <p><img alt="" src="linethrough-averaging.gif">
+    <p>In both cases, however, the superscript, due to the vertical-alignment shift,
+    has no effect on the position of the line.
   </div>
 
   <div class="note">