added impart stylesheet conditionally

Author: khan4019

css.html

@@ -432,8 +432,9 @@ <h2>15. filter</h2>
 </div>
 <div id="something">
   <h2>16. @import</h2>
-  <p><strong></strong></p>
-  <p><strong></strong></p>
+  <p><strong>Question:</strong> How can you load css resources conditionally?</p>
+  <p><strong>Answer:</strong> @import allows you to load/import stylesheet by using a prth (uri) representing the location of the file. You can define one or more media by comma seperation for which you want to load the stylesheet. If browser dont support the media stylesheet will not be loaded.</p>
+  <p>ref: be careful while using @import (<a href="http://www.stevesouders.com/blog/2009/04/09/dont-use-import/">don't use @import</a>)</p>
 </div>
 <div id="something">
   <h2>17. vertical alignment</h2>