[css-counter-styles] Add requirement that symbols(numeric|alphabetic) have at least two symbols.

Author: tabatkins

css-counter-styles/Overview.bs

@@ -983,6 +983,10 @@ Defining Anonymous Counter Styles: the ''symbols()'' function</h2>
 	and the provided <<string>>s and <<image>>s as the value of the 'symbols' property.
 	If the system is ''fixed'', the <i>first symbol value</i> is ''1''.
 
+	If the system is ''system/alphabetic'' or ''system/numeric'',
+	there must be at least two <<string>>s or <<image>>s,
+	or else the function is invalid.
+
 	<div class='example'>
 		This code:
 

css-counter-styles/Overview.html

@@ -59,7 +59,7 @@
 </p>
   <h1 class="p-name no-ref" id=title>CSS Counter Styles Level 3</h1>
   <h2 class="no-num no-toc no-ref heading settled heading" id=subtitle><span class=content>Editor’s Draft,
-    <span class=dt-updated><span class=value-title title=20140409>9 April 2014</span></span></span></h2>
+    <span class=dt-updated><span class=value-title title=20140414>14 April 2014</span></span></span></h2>
   <div data-fill-with=spec-metadata><dl><dt>This version:<dd><a class=u-url href=http://dev.w3.org/csswg/css-counter-styles/>http://dev.w3.org/csswg/css-counter-styles/</a><dt>Latest version:<dd><a href=http://w3.org/TR/css-counter-styles-3/>http://w3.org/TR/css-counter-styles-3/</a><dt>Editor’s Draft:<dd><a href=http://dev.w3.org/csswg/css-counter-styles/>http://dev.w3.org/csswg/css-counter-styles/</a><dt>Previous Versions:<dd><a href=http://www.w3.org/TR/2012/WD-css-counter-styles-3-20121009/ rel=previous>http://www.w3.org/TR/2012/WD-css-counter-styles-3-20121009/</a>
     <dt>Feedback:</dt>
         <dd><a href="mailto:www-style@w3.org?subject=%5Bcss-counter-styles%5D%20feedback">www-style@w3.org</a>
@@ -1047,6 +1047,10 @@ <h2 class="heading settled heading" data-level=4 id=symbols-function><span class
 	and the provided <a class="production css-code" data-link-type=type href=http://dev.w3.org/csswg/css-values-3/#string-value title="<string>">&lt;string&gt;</a>s and <a class="production css-code" data-link-type=type href=http://dev.w3.org/csswg/css-images-3/#image-type title="<image>">&lt;image&gt;</a>s as the value of the <a class=property data-link-type=propdesc href=#descdef-symbols title=symbols>symbols</a> property.
 	If the system is <a class=css data-link-type=maybe href=#valuedef-fixed title=fixed>fixed</a>, the <a data-link-type=dfn href=#first-symbol-value title="first symbol value">first symbol value</a> is <span class=css data-link-type=maybe title=1>1</span>.
 
+<p>	If the system is <a class=css data-link-for=system data-link-type=maybe href=#valuedef-alphabetic0 title=alphabetic>alphabetic</a> or <a class=css data-link-for=system data-link-type=maybe href=#valuedef-numeric0 title=numeric>numeric</a>,
+	there must be at least two <a class="production css-code" data-link-type=type href=http://dev.w3.org/csswg/css-values-3/#string-value title="<string>">&lt;string&gt;</a>s or <a class="production css-code" data-link-type=type href=http://dev.w3.org/csswg/css-images-3/#image-type title="<image>">&lt;image&gt;</a>s,
+	or else the function is invalid.
+
 	<div class=example>
 		This code:
 

css-counter-styles/issues-lc-20130718.txt

@@ -213,3 +213,9 @@ Comment:  http://lists.w3.org/Archives/Public/www-style/2014Mar/0139.html
 Response: http://lists.w3.org/Archives/Public/www-style/2014Mar/0204.html
 Closed:   Accepted
 ----
+Issue 29.
+Summary:  Spec should mention the minimum # of symbols requirement for symbols() function.
+From:     Xidorn Quan
+Comment:  http://lists.w3.org/Archives/Public/www-style/2014Apr/0121.html
+Response:
+Closed:   Accepted