Browser Support

Most browsers support basic file selection with drag & drop or a file input:

• File API
• Drag Event
• DataTransfer
• <input type="file">

Folder drop

For folder drop we use the File System API, which has more limited support:

• DataTransferItem.getAsFile()
• DataTransferItem.webkitGetAsEntry()
• FileSystemEntry
• FileSystemFileEntry.file()
• FileSystemDirectoryEntry.createReader()
• FileSystemDirectoryReader.readEntries()

Where it's available, directory traversal prefers the newer File System Access API, which avoids a class of failures in the legacy entries API (for example, dragging a folder from Windows Explorer into a Chromium browser).