Copy notes on text orientation customization from my notebook into a comment.

Author: fantasai

css3-writing-modes/Overview.src.html

@@ -1288,6 +1288,24 @@ <h3 id="text-orientation">
     </pre>
   </div>
 
+<!-- random notes
+  Property to customize text-orientation (and line breaking class) of various
+  characters (yes, the name is horrible, we need a better one):
+    text-symbolize: latin ||
+                    greek ||
+                    cyrillic ||
+                    letter-symbols || /* letterlike symbols and math letters */
+                    arrows || /* and math relation operators?? */
+                    currency || /* Sc */
+                    rotate-symbols || /* other So */
+
+  Do symbols NFC-fold to Latin/Greek? If so we might have a problem there.
+  
+  Roman numerals are poorly handled right now. If we make them upright, we
+  get the right behavior in most cases. But as soon as you get to 13, you
+  have a problem.
+-->
+
 <h2 id="abstract-box">
 Abstract Box Terminology</h2>
 
@@ -1392,7 +1410,7 @@ <h3 id="logical-directions">
     this means the <i>line-left</i> side. For boxes with a used 'direction'
     value of ''rtl'', this means the <i>line-right</i> side.
   <dt><dfn>end</dfn>
-    <dd>The side opposite the <i>start</i>.
+    <dd>The side opposite <i>start</i>.
   </dl>
 
   <p class="note">Note that while determining the <i>before</i> and