It provides a way to create, open, read, and write files directly. The File System API makes it possible for web apps to have easy and efficient file access. Also, the performance may not be satisfactory for frequent operations and large files. It is possible to simulate the file operations using IndexedDB API, an HTML input element with “file” type, an HTML anchor element with the download attribute, etc, but that would require good understanding of these standards and careful design for good user experience. For web apps, this might be hard to implement. For example, a general workflow is opening a file, making some changes, and saving the file. It is very common for an application to interact with local files.
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