[css2] Added explanation that spaces are allowed between tokens in a value,

bert-github · bert-github · commit a7896d0914a4 · 2003-04-29T15:47:01.000Z
using text proposed by Ian.

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402084
diff --git a/css2/about.src b/css2/about.src
@@ -2,7 +2,7 @@
   'http://www.w3.org/TR/html4/strict.dtd'>
 
 <html lang="en">
-<!-- $Id: about.src,v 2.51 2003-01-27 21:15:36 bbos Exp $ -->
+<!-- $Id: about.src,v 2.52 2003-04-29 15:47:01 bbos Exp $ -->
 <HEAD>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <TITLE>About the CSS&nbsp;2.1 Specification</TITLE>
@@ -221,6 +221,20 @@ the following modifiers:</p>
     <EM>Value:</EM> &lt;uri&gt; || &lt;color&gt;<BR>
 </BLOCKQUOTE>
 
+<p>Value types are specified in terms of tokens, as described in <a
+href="grammar.html#q2">Appendix G.2</a>. As the grammar allows spaces
+between tokens in the components of the <code>expr</code> production,
+spaces may appear between tokens in values.
+
+<p class=note>Note: In many cases, spaces will in fact be
+<em>required</em> between tokens in order to distinguish them from
+each other. For example, the value '1em2em' would be parsed as a
+single <code>DIMEN</code> token with the number '1' and the identifier
+'em2em', which is an invalid unit. In this case, a space would be
+required before the '2' to get this parsed as the two lengths '1em'
+and '2em'.
+
+
 <h4><a name="initial-value">Initial</a></h4>
 
 <P>This part specifies the property's initial value. If the property
