[css-text-3] Form feeds are treated like other Cc characters. w3c#855

Author: fantasai

css-text-3/Overview.bs

@@ -894,14 +894,12 @@ Text Processing</h3>
     <a href="https://www.w3.org/TR/CSS2/visuren.html#anonymous">9.2.2.1</a></p>
 
   <p>
-    Form feeds (U+000C)
-    (that are not <a>segment breaks</a>)
-    are rendered as a zero-width space (U+200B). <!-- thus can disrupt shaping -->
-    Control characters (<a>Unicode category</a> <code>Cc</code>)
-    other than tab (U+0009), line feed (U+000A), and form feed (U+000C),
+    Control characters (<a>Unicode category</a> <code>Cc</code>)--
+    other than tabs (U+0009), line feeds (U+000A),
+    and sequences that form a <a>segment break</a>--
     must be rendered as a visible glyph
-    which the UA must synthethize if the glyphs found in the font are not visible
-    and otherwise treated as any other character
+    which the UA must synthethize if the glyphs found in the font are not visible,
+    and must be otherwise treated as any other character
     of the Other Symbols (<code>So</code>) <a>general category</a> and Common <a lt="Unicode script">script</a>.
     The UA may use a glyph provided by a font specifically for the control character,
     substitute the glyphs provided for the corresponding symbol in the Control Pictures block,