MS has a proposal for a minimal set of functionality to support directory
picking via <input> and to support directory drag and drop.
https://microsoftedge.github.io/directory-upload/proposal.html
This spec is a work in progress but we now have an implementation for platforms
that have a native directory picker (desktop) landed and turned on in Nightly
only (the boolean pref is dom.input.dirpicker). The bug for keeping pace with
spec changes and eventually shipping is:
https://bugzilla.mozilla.org/show_bug.cgi?id=1188880
Currently we're waiting for MS to officially take their proposal to one of the
W3C groups, probably either one of:
https://lists.w3.org/Archives/Public/public-webapps/
https://lists.w3.org/Archives/Public/public-wicg/
Once that happens my expectation is that the proposal will change as feedback
comes in. Once things look stable enough to ship I'll send out an intent to ship.
For those who are interested I have a test page that demonstrates the API at:
https://jwatt.org/tmp/directory.html
If you file any bugs please CC me and mark them as blocking bug 1188880.
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