Dropping Safari 14 support (late 2023)

[lb-]

⚠️ Only to be done after Safari 17 is released

Follow up from #8051 & #8497 where the goal is to use CSS logical properties only for positioning.

Support for border-start-start-radius, border-start-end-radius, border-end-start-radius and border-end-end-radius properties are not included until Safari 14 and our current support is for the last 3 versions of Safari.

[zerolab]

Once we drop Safari 14, let's us drop the default webp to png conversion from

wagtail/wagtail/images/models.py

Line 933 in 32ff364

"webp": "png",

(ref: https://caniuse.com/webp)

[lb-]

With Safari 17 now out - this issue can be reviewed.

https://developer.apple.com/documentation/safari-release-notes/safari-17-release-notes

[thibaudcolas]

@lb- I’m working on this currently :)

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View caniuse Safari 14 vs 15.6

JavaScript

Nothing particularly substantial – view ES2016+ compat table

• ECMA2022 except Class static initialization blocks. See ECMA 2022 compat data.
• ECMA2023 (Array.findLast, Array.findLastIndex, Hashbang)

CSS

• color() function
• Logical Properties
• Small, Large, and Dynamic viewport units
• CSS Scroll-behavior
• LCH and Lab color values
• :has() CSS relational pseudo-class
• CSS Containment
• CSS Cascade Layers

DOM APIs

• createImageBitmap

HTML

• theme-color meta tag

[thibaudcolas]

This is out of date and should have been closed, my bad.

@zerolab when we make changes based on support targets it’s generally about the admin UI. I think dropping this conversion has merits but it’s very different to change how the Wagtail admin works for its editors / admin users, and how the site would work for end users. So I’d recommend a separate ticket for that (see #11681).