"I don’t think I’ve talked to a single developer who told me they felt entirely comfortable with the entire world of building websites. Everybody has weak spots or entire areas where they just don’t know the first dang thing. You not only can specialize, but specializing is a pretty good idea, and I think you will end up specializing to some degree whether you plan to or not. If you have the good fortune to plan, pick things that you like. You’ll do just fine."
The File System Access API enables developers to build powerful web apps that interact with files on the user's local device, like IDEs, photo and video editors, text editors, and more. After a user grants a web app access, this API allows them to read or save changes directly to files and folders on the user's device.