When Sourcegraph's Checkup (https://news.ycombinator.com/item?id=12240380) hit HN, I've discovered that the meaning of "static content" changed from "raw HTML with no backend and no frontend rendering" to "HTML + Javascript with no backend but possibly some frontend rendering"
It can be even looser than that, it can even just mean any server-side call that is inherently cache-able, meaning the same request will return the same data.
"Static" meaning "Not changing over time" rather than "Dynamic" meaning "changing over time". That usage is not common outside of math, but I have on occasion seen it used this way when discussing web programming.
