Browser-compat-data: Mapping of Safari Tech Previews to actual Safari releases?

[Elchi3]

The Safari docs and support information sources are sparse. This makes it hard to review data update PRs. The Safari TP release notes are quite good, however. Does anyone know how you can map TP versions to actual Safari versions?

What we know:
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

[a2sheppy]

That's a good idea, potentially.

The bigger problem in the short term, I think, is that we currently have no way to indicate that a feature landed in a particular TP version. The notion of the browser actually having different version number standards in its developer build releases is not something our schema allows for.

[Elchi3]

Good news, everyone! At least for Safari 12.1 Apple provides us with such a mapping, see the release notes: https://webkit.org/blog/8718/new-webkit-features-in-safari-12-1 all the way down to "Feedback":

"Changes in this release of Safari were included in the following Safari Technology Preview releases: 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76."

So, that's a lot of features we could mark as "12.1".

[Elchi3]

For Safari 11:

"Changes in this release of Safari were included in the following Safari Technology Preview releases: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36."

Source: https://webkit.org/blog/7956/new-webkit-features-in-safari-11/

[vinyldarkscratch]

For Safari 10.1:

"The changes included in this release of Safari span Safari Technology Preview releases 14, 15, 16, 17, 18, 19, and 20."

Source: https://webkit.org/blog/7477/new-web-features-in-safari-10-1/

[craigkovatch]

Apple also removed the release notes for Safari <12 from their developer pages :( Anyone have a contact there they could ping?

[vinyldarkscratch]

The following blog post makes it sound like Safari TP 84 is when changes are frozen for Safari 13's release: https://webkit.org/blog/9170/safari-technology-preview-84-with-safari-13-features-is-now-available/

[a2sheppy]

We should start archiving copies of release notes for browsers, so that we have access to them even if the developer decides to remove them from their site.

[Elchi3]

https://webkit.org/blog/9674/new-webkit-features-in-safari-13/ says "changes in this release of Safari were included in the following Safari Technology Preview releases: 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89."

Thus updated our mapping for Safari 13.
Still waiting on something for Safari 13.1.