[css-counter-styles] Handle unknown counter styles generically in the representation algorithm.

Author: tabatkins

css-counter-styles/Overview.bs

@@ -80,6 +80,11 @@ Counter Styles</h2>
 	follow these steps:
 
 	<ol>
+		<li>
+			If the counter style is unknown,
+			exit this algorithm and instead <i>generate a counter representation</i>
+			using the ''decimal'' style and the same counter value.
+
 		<li>
 			If the counter value is outside the 'range' of the counter style,
 			exit this algorithm and instead <i>generate a counter representation</i>
@@ -1020,9 +1025,6 @@ Extending 'list-style-type', ''counter()'', and ''counters()''</h2>
 		<dfn type>&lt;counter-style></dfn> = <<counter-style-name>> | <a>symbols()</a>;
 	</pre>
 
-	If an unknown <<counter-style-name>> is provided,
-	it must be treated the same as ''decimal'' for the purpose of generating representations.
-
 
 <!--
    SSSSSSSSSSSSSSS      tttt                              lllllll

css-counter-styles/Overview.html

@@ -234,6 +234,11 @@ <h2 class="heading settled heading" data-level=2 id=counter-styles><span class=s
 	follow these steps:
 
 	<ol>
+		<li>
+			If the counter style is unknown,
+			exit this algorithm and instead <a data-link-type=dfn href=#generate-a-counter title="generate a counter representation">generate a counter representation</a>
+			using the <a class=css data-link-type=maybe href=#valuedef-decimal title=decimal>decimal</a> style and the same counter value.
+
 		<li>
 			If the counter value is outside the <a class=property data-link-type=propdesc href=#descdef-range title=range>range</a> of the counter style,
 			exit this algorithm and instead <a data-link-type=dfn href=#generate-a-counter title="generate a counter representation">generate a counter representation</a>
@@ -1076,9 +1081,6 @@ <h2 class="heading settled heading" data-level=5 id=extending-css2><span class=s
 
 	<pre class=prod>  <dfn class=css-code data-dfn-type=type data-export="" id=typedef-counter-style>&lt;counter-style&gt;<a class=self-link href=#typedef-counter-style></a></dfn> = <a class="production css-code" data-link-type=type href=#typedef-counter-style-name title="<counter-style-name>">&lt;counter-style-name&gt;</a> | <a data-link-type=functionish href=#funcdef-symbols title=symbols()>symbols()</a>;
 </pre>
-<p>	If an unknown <a class="production css-code" data-link-type=type href=#typedef-counter-style-name title="<counter-style-name>">&lt;counter-style-name&gt;</a> is provided,
-	it must be treated the same as <a class=css data-link-type=maybe href=#valuedef-decimal title=decimal>decimal</a> for the purpose of generating representations.
-