Yeah, in my OP I was meaning the WWW specifically, so the things developed for use with the WWW (HTML, CSS, HTTP, etc.) Networking (TCP/IP, UDP, etc.) are not WWW specific.
Now having said that, sure I've seen some defence projects that make use of HTTP or have internal "web"sites for managing interfaces. It's even a trend for embedded hardware to have web management interfaces (your internet router/modem is a great example).
But when I say "web", of course I was really meaning user-facing/world facing websites. That seems to be the implication behind "front end developer". Not "I make front ends for building automation systems" but "I make front ends for websites hosted on the WWW". Requires a slightly different set of knowledge imo. One is tailored for looks and UX, the other is a trade-off between minimalism, efficiency, and usability (if only this was applied more to the major sites you see on the WWW now!).
Semantics, but JavaScript itself is not a "web technology" - despite being conceived for the purpose of web scripting the original publication for version 1 even calls out that the language can be used on a variety of host environments (not limited to browsers). This can largely be seen in host environments like Node.js where it acts like any other similar language.
By that logic, CSS is not a web technology because it can also be used in GUI toolkits like GTK[1]. HTML is used in ePUB files[2], so I guess it's not a web technology either...
Would protocols that use HTTP for transport like gRPC[3] mean that HTTP is not a web technology either? I don't know what is a web technology anymore...
HTTP, HTML, CSS, JavaScript, etc are web technologies.
TCP/IP (among other things) are internet technologies.
Web tech builds upon internet tech.