Add big5 encoder quirk. Fixes https://www.w3.org/Bugs/Public/show_bug…

….cgi?id=27878

Overview.html

@@ -875,6 +875,21 @@ <h2 id="indexes"><span class="secno">6 </span>Indexes</h2>
  <var title="">index</var>.
 </ol>
 
+<p>The <dfn id="index-big5-pointer">index big5 pointer</dfn> for <var>code point</var> is the return value of
+these steps:
+
+<ol>
+ <li><p>Let <var>index</var> be <a href="#index-big5">index big5</a>.
+
+ <li><p>If <var>code point</var> is U+2550, U+255E, U+2561, U+256A, U+5341, or U+5345,
+ return the <em>last</em> pointer corresponding to <var>code point</var> in
+ <var>index</var>.
+ <!-- https://www.w3.org/Bugs/Public/show_bug.cgi?id=27878 -->
+
+ <li><p>Return the <a href="#index-pointer">index pointer</a> for <var>code point</var> in
+ <var>index</var>.
+</ol>
+
 <hr>
 
 <p class="note no-backref">All <a href="#index" title="index">indexes</a> are also available as
@@ -1873,8 +1888,8 @@ <h4 id="big5-encoder"><span class="secno">12.1.2 </span><dfn>big5 encoder</dfn><
  <li><p>If <var title="">code point</var> is an <a href="#ascii-code-point">ASCII code point</a>, return
  a byte whose value is <var title="">code point</var>.
 
- <li><p>Let <var title="">pointer</var> be the <a href="#index-pointer">index pointer</a> for
- <var title="">code point</var> in <a href="#index-big5">index big5</a>.
+ <li><p>Let <var>pointer</var> be the <a href="#index-big5-pointer">index big5 pointer</a> for
+ <var>code point</var>.
 
  <li><p>If <var title="">pointer</var> is null, return <a href="#error">error</a> with
  <var title="">code point</var>.

Overview.src.html

@@ -789,6 +789,21 @@ <h2>Indexes</h2>
  <var title>index</var>.
 </ol>
 
+<p>The <dfn>index big5 pointer</dfn> for <var>code point</var> is the return value of
+these steps:
+
+<ol>
+ <li><p>Let <var>index</var> be <span>index big5</span>.
+
+ <li><p>If <var>code point</var> is U+2550, U+255E, U+2561, U+256A, U+5341, or U+5345,
+ return the <em>last</em> pointer corresponding to <var>code point</var> in
+ <var>index</var>.
+ <!-- https://www.w3.org/Bugs/Public/show_bug.cgi?id=27878 -->
+
+ <li><p>Return the <span>index pointer</span> for <var>code point</var> in
+ <var>index</var>.
+</ol>
+
 <hr>
 
 <p class="note no-backref">All <span title=index>indexes</span> are also available as
@@ -1787,8 +1802,8 @@ <h4><dfn>big5 encoder</dfn></h4>
  <li><p>If <var title>code point</var> is an <span>ASCII code point</span>, return
  a byte whose value is <var title>code point</var>.
 
- <li><p>Let <var title>pointer</var> be the <span>index pointer</span> for
- <var title>code point</var> in <span>index big5</span>.
+ <li><p>Let <var>pointer</var> be the <span>index big5 pointer</span> for
+ <var>code point</var>.
 
  <li><p>If <var title>pointer</var> is null, return <span>error</span> with
  <var title>code point</var>.