This is a standalone example for static Astro projects. The site where I measured it, straffesites.com , does not use the script in production. In October 2026, I did run it on a copy of that site's build to measure what a post-build step does to your Astro HTML. The script adds unique IDs to headings that do not have one yet and minifies the files with html-minifier-terser. Here is how to set it up, what the measurement showed, and what to watch out for. What do you need to get sta...