[css3-syntax] Specify that an+b only uses integers.

--HG--
extra : rebase_source : 5eb70fc37b94aa7ea0d14759b31c8898998cb1ca

Author: tabatkins

css3-syntax/Overview.html

@@ -3962,17 +3962,18 @@ <h3 id=parse-anb-notation><span class=secno>6.7. </span> <dfn
    <var>step</var> to 1. Otherwise, if the first string consists solely of a
    single U+002B PLUS SIGN (+) or U+002D HYPHEN-MINUS (-), set the
    <var>step</var> to 1 or -1, respectively. Otherwise, attempt to interpret
-   the first string as a base-10 number. If the attempt succeeds, set the
-   <var>step</var> to that number. Otherwise, this is a <i>parse error</i>;
-   return a syntax error. If the second string is empty, set the
-   <var>offset</var> to 0. Otherwise, attempt to interpret the second string
-   as a base-10 number. If the attempt succeeds, set the <var>offset</var> to
-   that number. Otherwise, this is a <i>parse error</i>; return a syntax
-   error.
+   the first string as a base-10 number. If the attempt succeeds and produces
+   an integer, set the <var>step</var> to that integer. Otherwise, this is a
+   <i>parse error</i>; return a syntax error. If the second string is empty,
+   set the <var>offset</var> to 0. Otherwise, attempt to interpret the second
+   string as a base-10 number. If the attempt succeeds and produces an
+   integer, set the <var>offset</var> to that integer. Otherwise, this is a
+   <i>parse error</i>; return a syntax error.
 
   <p> Otherwise, attempt to interpret <var>repr</var> as a base-10 number. If
-   the attempt succeeds, set the <var>offset</var> to that number. Otherwise,
-   this is a <i>parse error</i>; return a syntax error.
+   the attempt succeeds and produces an integer, set the <var>offset</var> to
+   that integer. Otherwise, this is a <i>parse error</i>; return a syntax
+   error.
 
   <h2 id=serialization><span class=secno>7. </span>Serialization</h2>
 

css3-syntax/Overview.src.html

@@ -3520,22 +3520,22 @@ <h3>
 		U+002D HYPHEN-MINUS (-),
 		set the <var>step</var> to 1 or -1, respectively.
 		Otherwise, attempt to interpret the first string as a base-10 number.
-		If the attempt succeeds,
-		set the <var>step</var> to that number.
+		If the attempt succeeds and produces an integer,
+		set the <var>step</var> to that integer.
 		Otherwise, this is a <i>parse error</i>;
 		return a syntax error.
 		If the second string is empty,
 		set the <var>offset</var> to 0.
 		Otherwise, attempt to interpret the second string as a base-10 number.
-		If the attempt succeeds,
-		set the <var>offset</var> to that number.
+		If the attempt succeeds and produces an integer,
+		set the <var>offset</var> to that integer.
 		Otherwise, this is a <i>parse error</i>;
 		return a syntax error.
 
 	<p>
 		Otherwise, attempt to interpret <var>repr</var> as a base-10 number.
-		If the attempt succeeds,
-		set the <var>offset</var> to that number.
+		If the attempt succeeds and produces an integer,
+		set the <var>offset</var> to that integer.
 		Otherwise, this is a <i>parse error</i>;
 		return a syntax error.