Adjust required range to 2^24 per <http://lists.w3.org/Archives/Public/www-style/2012Apr/0490.html>

Author: fantasai

css3-values/Overview.html

@@ -748,7 +748,7 @@ <h2 id=numeric-types><span class=secno>4. </span> Numeric Data Types</h2>
   <p> Properties may restrict numeric values to some range. If the value is
    outside the allowed range, the declaration is invalid and must be <a
    href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignored</a>. For
-   unrestricted values, UAs must support at least up to ±2<sup>27</sup>-1;
+   unrestricted values, UAs must support at least up to ±2<sup>24</sup>-1;
    unsupported values must be clamped to the closest supported value. When
    arithmetic is performed with numeric types (for example, in the calc()
    expression, or when doing unit conversions), if the result is outside the

css3-values/Overview.src.html

@@ -424,7 +424,7 @@ <h2 id="numeric-types">
 		Properties may restrict numeric values to some range.
 		If the value is outside the allowed range,
 		the declaration is invalid and must be <a href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignored</a>.
-		For unrestricted values, UAs must support at least up to ±2<sup>27</sup>-1; 
+		For unrestricted values, UAs must support at least up to ±2<sup>24</sup>-1; 
 		unsupported values must be clamped to the closest supported value.
 		When arithmetic is performed with numeric types
 		(for example, in the calc() expression, or when doing unit conversions),