[css2] fix issue 82 for Tantek

fantasai · fantasai · commit bf49ba60ac38 · 2006-05-09T13:24:08.000Z
--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402453
diff --git a/css2/visuren.src b/css2/visuren.src
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
 <html lang="en">
-<!-- $Id: visuren.src,v 2.128 2006-05-09 13:03:48 fantasai Exp $ -->
+<!-- $Id: visuren.src,v 2.129 2006-05-09 13:24:08 fantasai Exp $ -->
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Visual formatting model</title>
@@ -1931,7 +1931,9 @@ properties
 not support bidirectional text may ignore the <span
 class="propinst-direction">'direction'</span> and <span
 class="propinst-unicode-bidi">'unicode-bidi'</span> properties
-described in this section.
+described in this section. This exception includes UAs that render
+right-to-left characters simply because a font on the system contains them
+but do not support the concept of right-to-left text direction.
 
 <p>The characters in certain scripts are written from right to
 left. In some documents, in particular those written with the Arabic
@@ -1951,14 +1953,14 @@ class="propinst-unicode-bidi">'unicode-bidi'</span> properties allow
 authors to specify how the elements and attributes of a document
 language map to this algorithm.
 </p>
-<p>
-If the rendered content contains right-to-left characters, and if the user
-agent displays these characters in right-to-left order, the user
-agent must apply the bidirectional algorithm. 
-(UAs that render right-to-left characters simply because a font on
-the system contains them but do not support the concept of
-right-to-left text direction are exempt from this requirement.)
-</p>
+<p>User agents that support bidirectional text must apply the Unicode
+bidirectional algorithm to every sequence of inline boxes uninterrupted
+by a forced line break or block boundary. This sequence forms the
+"paragraph" unit in the bidirectional algorithm. The paragraph embedding
+level is set according to the value of the <span
+class="propinst-direction">'direction'</span> property of the containing
+block rather than by the heuristic given in steps P2 and P3 of the Unicode
+algorithm.</p>
 <p>Because the directionality of a text depends on the structure and
 semantics of the document language, these properties should in most
 cases be used only by designers of document type descriptions (DTDs),
