Using files from web applications - Web APIs | MDNUsing the File API, web content can ask the user to select local files and then read the contents of those files. This selection can be done by either using an HTML <input type="file"> element or by drag and drop.
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W3C FileAPI in Firefox 3.6 – Mozilla Hacks - the Web developer blog
Often, web applications will prompt the user to select a file, typically to upload to a server. Unless the web application makes use of a plugin, file selection occurs through an HTML input element, of the sort <input type="file"/>. Firefox 3.6 now supports much of the W3C File API, which specifies the ability to asynchronously read the selected file into memory, and perform operations on the file
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