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As part of Mozilla's effort to reduce the Web's dependency on Flash we have recently been working on a Microsoft proposal called Directory Upload to provide directory picking and directory drag-and-drop. (This proposal is a simplification of part of the FileSystem API draft , a much more comprehensive set of filesystem APIs.) After providing several rounds of feedback to the Microsoft guys, the Directory Upload proposal has been made available for wider feedback, and we have an implementation enabled in Nig
For those that are aware of it, the obvious question will be why didn't we just standardize the behavior introduced with the webkitdirectory attribute for the <input> element (introduced in Chrome 11, but not available in Safari)? Standardizing that behavior would make it easier for content authors to update existing content that currently uses webkitdirectory to also support non-Chrome browsers in the future.