Diff Codeblock Highlight

Add this to the head of your HTML Page, or add Shiki.

<script src="https://esm.sh/[email protected]" defer async></script>

Edit the codeblock.

--- old_file.txt
+++ new_file.txt
@@ -1,3 +1,3 @@
-Hello, old world!
+Hello, new world!

Copy paste this.