[css-text-3] Form feeds and carraige returns are made invisible zwsp-style (can disrupt shaping). #855

Author: fantasai

css-text-3/Overview.bs

@@ -561,7 +561,7 @@ Characters and Letters</h3>
   <p>
     Form feeds (U+000C) and carriage returns (U+000D)
     (that are not <a>segment breaks</a>)
-    are <span class="issue">not rendered | rendered as a zero-width space</span>.
+    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), form feed (U+000C), and carriage return (U+000D)
     must be rendered as a visible glyph