icon section

Author: ethanpalm

code.mdx

@@ -177,7 +177,17 @@ const hello = "world";
 ````
 
 ## Icon
-TODO: - icon `string`: it can be a fontawesome icon, lucide icon, or icon with absolute url (no icons with relative paths yet)
+Add an icon to a code block using a string. You can use FontAwesome icons, Lucide icons, or icons with absolute URLs.
+
+```javascript icon="globe"
+const hello = "world";
+```
+
+````md icon="globe"
+```javascript icon="globe"
+const hello = "world";
+```
+````
 
 ## Line Highlighting
 TODO: - highlight `expression | string`: `{1, 3-5}` or `"1, 4-5"`