w3c/webvtt — pull request #156 by foolip (2014-10-17 20:56:13+00:00)
Title: Put the source commit in <meta name="revision">

For fun, to keep track of which commit snapshots are made from, and
potentially to generate a link showing changes since the snapshot.

The revision keyword is registered and accepted by validator.nu:
https://wiki.whatwg.org/wiki/MetaExtensions