Drop prefixer

[Andarist]

closes #2747

IMHO, this plugin is not really needed in 2025, but I haven't rechecked whether all the included rules are obsolete. Many are, we definitely shouldn't be prefixing flexbox

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🦋 Changeset detected

Latest commit: 37fa86e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@emotion/styled	Major
@emotion/cache	Major
@emotion/react	Major
@emotion/css	Major
@emotion/primitives-core	Major
@emotion/server	Major
@emotion/native	Major
@emotion/primitives	Major

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[emmatown]

I basically agree with this (and probably agree with shipping it in the next major in a way that I don't really with #3294) with the caveat that to understand whether all of it is actually obselete, it'd be good to see something like: run the stylis prefixer over some specifically generated css to exercise all the properties that stylis prefixes, compare that with caniuse/mdn compat data/whatever and see what we get

[Andarist]

Quick look on caniuse:

declaration	browser support	notes
color-adjust	19%	deprecated
animation, animation-(delay|direction|duration|fill-mode|iteration-count|name|play-state|timing-function)	97%
text-decoration	83%	97% with prefixes
filter	98%
clip-path	95%
backface-visibility	97%
column	97%
box-decoration-break	69%	98% with prefixes
mask, mask-image, mask-(mode|clip|size), mask-(repeat|origin), mask-position, mask-composite,	92.5%	98% with prefixes
background-clip	97%
columns, column-(count|fill|gap|rule|rule-color|rule-style|rule-width|span|width)	97%
appearance	96%
user-select	79%	97% with prefixes
transform,	98%
hyphens	94%
text-size-adjust	77%	92% with prefixes
transition	97%
cursor	80%	no change with prefixes
background, background-image	97%
(margin|padding)-inline-(start|end)	97%
(min|max)?(width|height)	97%
(min|max)(inline-size|block-size)	96%
stretch, max-content, min-content, fill-available	97%
(m)ax-content, (m)in-content	97%
(f)ill-available, (f)it-content	97%
(s)tretch	98%
position: sticky	97%
writing-mode	98%
vertical-l(r)	97%
vertical-r(l)	97%
horizontal(-)tb	97%
:read-(only|write)	98%
:placeholder	97.7%