line highlighting and focusing

Author: ethanpalm

code.mdx

@@ -44,7 +44,7 @@ class HelloWorld {
 * **Expression options**: Wrap with `{}`, `""`, or `''`.
 
 ## Syntax highlighting
-Enable syntax highlighting by specifying the programming language after the opening backticks of a code block. The language name is a string.
+Enable syntax highlighting by specifying the programming language after the opening backticks of a code block.
 
 ```java
 class HelloWorld {
@@ -164,7 +164,7 @@ We use [Shiki](https://shiki.style/languages) for syntax highlighting and suppor
 </table>
 
 ## Title
-Add a title after the programming language to label a code example. Titles can be any string on a single line.
+Add a title after the programming language to label your code example. Titles can be any string on a single line.
 
 ```javascript Code Block Example
 const hello = "world";
@@ -177,7 +177,7 @@ const hello = "world";
 ````
 
 ## Icon
-Add an icon to a code block using a string. You can use FontAwesome icons, Lucide icons, or icons with absolute URLs.
+Add an icon to your code block. You can use FontAwesome icons, Lucide icons, or absolute URLs.
 
 ```javascript icon="globe"
 const hello = "world";
@@ -190,8 +190,7 @@ const hello = "world";
 ````
 
 ## Line Highlighting
-TODO: - highlight `expression | string`: `{1, 3-5}` or `"1, 4-5"`
-Highlight specific lines in your code blocks by adding a special comment after the language identifier. Use curly braces `{}` and specify line numbers or ranges separated by commas.
+Highlight specific lines in your code blocks using `highlight` with the line numbers or ranges you want to highlight.
 
 ```javascript Line Highlighting Example {1,3-5}
 const greeting = "Hello, World!";
@@ -212,7 +211,25 @@ sayHello();
 ````
 
 ## Line focusing
-TODO: - focus `expression | string`: `{1, 3-5}` or `"1, 4-5"`
+Focus on specific lines in your code blocks using `focus` with line numbers or ranges.
+
+```javascript Line Focus Example {2,4-5}
+const greeting = "Hello, World!";
+function sayHello() {
+  console.log(greeting);
+}
+sayHello();
+```
+
+````md
+```javascript Line Focus Example {2,4-5}
+const greeting = "Hello, World!";
+function sayHello() {
+  console.log(greeting);
+}
+sayHello();
+```
+````
 
 ## Show line numbers
 TODO: - showLineNumbers `boolean`