Is this standardized yet?

[danielhjacobs]

webkitdirectory is now supported in Chrome for Android and the latest WebKit commits for iOS, so I'm just curious if this is a standard. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#webkitdirectory still notes that "even though it has relatively broad support, it is still not standard and should not be used unless you have no alternative."