CSS and HTML are frameworks though. You're not having to position elements directly to the graphics card's frame buffer; you're using markup frameworks supported by a browser rendering engine - which often depends on 3rd party code like image libraries (libpng et al) and SSL/TLS libraries (eg NSS, OpenSSL, etc. Then you have OS APIs (Win32, GTK+, etc), graphics and sound drivers, kernel ABIs, hardware firmware, etc. It's quite an extensive stack of frameworks and libraries between your code and what actually appears on screen. Even your PHP server side code depends on hundreds of inbuilt libraries to be useful, dozens 3rd party libraries (OpenSSL, MySQL drivers, etc), plus the usual OS stack.

So you're very much stacking endless libraries and frameworks on top of one another - even if a lot of this stuff happens transparently to yourself. Which is why software can be an absolute pig to debug when remote clients report subtle bugs. Sometimes it's impossible to differentiate between an "eclectic" software configuration and just plan user error.