What language does GitHub pages use?

According to Stack Overflow’s 2020 Developer Survey, JavaScript currently stands as the most commonly-used language in the world (69.7%), followed by HTML/CSS (62.4%), SQL (56.9%), Python (41.6%) and Java (38.4%).

GitHub’s breakdown makes it clear: JavaScript remains the most-utilized language among its developers, followed by Python and Java .3 Ara 2020

GitHub Pages is a static site hosting service that takes HTML, CSS, and JavaScript files straight from a repository on GitHub, optionally runs the files through a build process, and publishes a website.