Interacting with Files
Working with different files is a common activity—although much more so on desktops or laptops than on mobile devices—so an API is available for doing this on the Web too. The File API is a fairly low-level API that allows you to get information about files and to access their contents, and there are a few higher-level APIs that I’ll mention in due course.
To access files, you can either choose them using the file input element or drag them from a folder on your system (depending on the system you use) with the Drag and Drop API, which is the approach we’ll look at here.
The dataTransfer object, which I just discussed in the previous section, contains a files child object that contains a list of all the files dropped into ...
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