I’d heard rumblings that GitHub’s in the middle of shipping a frontend rewrite in React, and I realized this must be it. The problem wasn’t that the line I wanted wasn’t on the page–it’s that the whole document wasn’t being rendered at once, so my browser’s builtin search bar just couldn’t find it. On a hunch, I tried disabling JavaScript entirely in the browser, and suddenly it started working again. GitHub is able to send a fully server-side rendered version of the page, which actually works like it should, but doesn’t do so unless JavaScript is completely unavailable.

Source: GitHub is starting to feel like legacy software - OSnews

I’m surprised based on what I know about GitHub’s engineering choices.