Update GCSE CS blog

computer-science-blog/pages/blog.html

@@ -41,6 +41,7 @@
 					<code>[condition] ? [value if true] : [value if false]</code>
 				</li>
 				<li>The later a CSS file is imported, the more power it has over the document - i.e. the last stylesheet imported will overwrite the styling in all of the other stylesheets.</li>
+				<li>To add another page, one can use an <code>&lt;iframe&gt;</code></li>
 			</ul>
 		</p>
 	</body>