Why is HTML5 input type datetime removed from browsers already supporting it?

The only reason I can think of is browser vendors losing faith in the standard being approved, therefore removing the implementation from their code.

To support this thought: W3C just removed both datetime and datetime-local from their working draft.

Browser vendors will eventually drop support of both of them.

According to html5test most of the current browsers removed support of both of the input types.

The latest development:

The datetime-local is back on the draft;
The newer specs page doesn't show datetime, but it does show datetime-local. It does sound like it is back on the map and going to be supported again!

Also take notice of this related post on Webmasters.SE: Is datetime-local removed from HTML 5.1?.

Source http://www.w3.org/TR/html5/

"The following features are at risk and may be removed due to lack of implementation.
..<input type=datetime>.."

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