Indeed, it's important to note that the answer to everything software engineers do is something like this. "If it's a bug in my application I can probably fix

Indeed, it's important to note that the answer to everything software engineers do is something like this. "If it's a bug in my application I can probably fix it. If the origin of the bug is the OS kernel I might need some time. If something's wrong with hardware I'm probably screwed." Which is to say that, in some sense, the answer to the grandparent's question for a simple HTML page is quite obviously no, even for the most experienced web developer. Except of course that this guy is probably less screwed than the typical software engineer because he (at least physically) connected the hardware components.