Resources for finding browser versions for features

• https://storage.googleapis.com/chromium-find-releases-static/index.html
• https://trac.webkit.org/browser/webkit/tags/

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• https://lab.syncer.jp/Web/API_Interface/Reference/IDL/ (in Japanese)

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Mapping of Safari Tech Previews to actual Safari releases

From https://github.com/mdn/browser-compat-data/issues/2991

TP versions	Safari version
TP 1-13	Safari 10
TP 14-20	Safari 10.1
TP 21-36	Safari 11
TP 37-47	Safari 11.1
TP 48-58	Safari 12
TP 59-76	Safari 12.1
TP 77-89	Safari 13
TP 90-??	Safari 13.1