Make calc() sometimes have a resolved type of <integer>.

Author: tabatkins

css3-values/Overview.src.html

@@ -883,11 +883,12 @@ <h3 id="calc-notation">
 	as component values.  The ''calc()'' expression represents the result of the
 	mathematical calculation it contains, using standard operator precedence
 	rules. It can be used wherever
-	<code>&lt;length&gt;</code>,
-	<code>&lt;frequency&gt;</code>,
-	<code>&lt;angle&gt;</code>,
-	<code>&lt;time&gt;</code>, or
-	<code>&lt;number&gt;</code>
+	<var>&lt;length&gt;</var>,
+	<var>&lt;frequency&gt;</var>,
+	<var>&lt;angle&gt;</var>,
+	<var>&lt;time&gt;</var>,
+	<var>&lt;number&gt;</var>, or
+	<var>&lt;integer></var>
 	values are allowed.</p>
 
 	<p>
@@ -1006,18 +1007,24 @@ <h4 id='calc-syntax'>
 <h4 id='calc-type-checking'>
 Type Checking</h4>
 
-	<p>A math expression has a <dfn>resolved type</dfn>, which is one of
-	<var>&lt;length></var>, <var>&lt;frequency></var>, <var>&lt;angle></var>, <var>&lt;time></var>, or
-	<var>&lt;number></var>.  The <i>resolved type</i> must be valid for where the 
-	expression is placed; otherwise, the expression is invalid.  
-	The <i>resolved type</i> of the expression is determined by the 
-	types of the values it contains. <code>NUMBER</code> tokens 
-	are of type <var>&lt;number></var>. A <code>DIMENSION</code> token's type is given 
-	by its unit (''cm'' is <var>&lt;length></var>, ''deg'' is <var>&lt;angle></var>, etc.).
-	If percentages are accepted in the context in which the expression
-	is placed, a <code>PERCENTAGE</code> token has the type of the value that 
-	percentages are relative to; otherwise, a math expression containing
-	percentages is invalid.</p>
+	<p>
+		A math expression has a <dfn>resolved type</dfn>, which is one of
+		<var>&lt;length></var>, 
+		<var>&lt;frequency></var>, 
+		<var>&lt;angle></var>, 
+		<var>&lt;time></var>,
+		<var>&lt;number></var>, or
+		<var>&lt;integer></var>.  
+		The <i>resolved type</i> must be valid for where the expression is placed; 
+		otherwise, the expression is invalid. 
+		The <i>resolved type</i> of the expression is determined by the types of the values it contains. 
+		<code>NUMBER</code> tokens are of type <var>&lt;number></var>. 
+		A <code>DIMENSION</code> token's type is given by its unit 
+		(''cm'' is <var>&lt;length></var>, ''deg'' is <var>&lt;angle></var>, etc.). 
+		If percentages are accepted in the context in which the expression is placed, 
+		a <code>PERCENTAGE</code> token has the type of the value that percentages are relative to; 
+		otherwise, 
+		a math expression containing percentages is invalid.</p>
 
 	<p>Operators form sub-expressions, which gain types based on their arguments.
 	To make expressions simpler, operators have restrictions on the
@@ -1043,6 +1050,12 @@ <h4 id='calc-type-checking'>
 	(as purely-numeric expressions can be evaluated without any additional 
 	information at parse time).</p>
 
+	<p>
+		If the type of the result,
+		after resolving all subexpressions,
+		is an integral <code>&lt;number></code>,
+		the calc()&apos;s resolved type is <code>&lt;integer></code>.
+
 <h4 id='calc-range'>
 Range Checking</h4>