[1] [css-2017] First take on the 2017 snapshot (frivoal著, 1/14/2017, 6:10:55 AM) <https://github.com/w3c/csswg-drafts/commit/f1adcde5af3458872b7d74ebe1d6c2a0edf40277>
Google search: CSS Snapshot 2017