Storing USF subtitles in Matroska

Hello,

because the storage for WebVTT subtitles is being specified now I
noticed that USF is listed in the Codec Specs [1], but the specification
that goes into details [2] says "Under Construction".

The Codec Specs says it is mostly defined but not typed out yet.

Is this still something that has to be done?

The specification of the USF subtitle format seems to be located at some
private website [3].

Greetings,
Sebastian

[1] https://www.matroska.org/technical/specs/codecid/index.html
[2] https://www.matroska.org/technical/specs/subtitles/usf.html
[3] http://www.titlevision.dk/usf.htm
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