Don't transition visibility when using transition (tailwindlabs#18795)

We introduced an accidental breaking change a few months ago in 4.1.5
with tailwindlabs#17812.

We added `visibility` to the property list in `transition` which
unfortunately only applies its change instantly when going from
invisible -> visible.

I've checked `display`, `content-visibility`, and `pointer-events` and
they apply their change instantly (as best I can tell) when
transitioning by default. And `overlay` only "applies" for discrete
transitions so it can stay as well.

The spec has this to say about [animating
`visibility`](https://www.w3.org/TR/web-animations-1/#animating-visibility):
> For the visibility property, visible is interpolated as a discrete
step where values of p between 0 and 1 map to visible and other values
of p map to the closer endpoint; if neither value is visible then
discrete animation is used.

This means that for visible (t=0) -> hidden (t=1) the timeline looks
like this:
- t=0.0: visible
- t=0.5: visible
- t=0.999…8: visible
- t=1.0: invisible

This means that for invisible (t=0) -> visible (t=1) the timeline looks
like this:
- t=0.0: invisible
- t=0.000…1: visible
- t=0.5: visible
- t=1.0: visible

So the value *is* instantly applied if the element is initially
invisible but when going the other direction this is not the case. This
happens whether or not the transition type is discrete.

While the spec calls out [`display` as working
similarly](https://drafts.csswg.org/css-display-4/#display-animation) in
practice this is only the case when `transition-behavior` is explicitly
set to `allow-discrete` otherwise the change is instant for both
directions.

Fixes tailwindlabs#18793

Author: thecrypticace

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Drop warning from browser build ([#18731](https://github.com/tailwindlabs/tailwindcss/issues/18731))
 
+### Fixed
+
+- Don't transition `visibility` when using `transition` ([#18795](https://github.com/tailwindlabs/tailwindcss/pull/18795))
+
 ## [4.1.12] - 2025-08-13
 
 ### Fixed

packages/tailwindcss/src/utilities.test.ts

@@ -22091,7 +22091,7 @@ test('transition', async () => {
     }
 
     .transition {
-      transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, visibility, content-visibility, overlay, pointer-events;
+      transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, content-visibility, overlay, pointer-events;
       transition-timing-function: var(--tw-ease, var(--default-transition-timing-function));
       transition-duration: var(--tw-duration, var(--default-transition-duration));
     }
@@ -22153,7 +22153,7 @@ test('transition', async () => {
     ),
   ).toMatchInlineSnapshot(`
     ".transition {
-      transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, visibility, content-visibility, overlay, pointer-events;
+      transition-property: color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, content-visibility, overlay, pointer-events;
       transition-timing-function: var(--tw-ease, ease);
       transition-duration: var(--tw-duration, .1s);
     }

packages/tailwindcss/src/utilities.ts

@@ -4504,7 +4504,7 @@ export function createUtilities(theme: Theme) {
 
     functionalUtility('transition', {
       defaultValue:
-        'color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, visibility, content-visibility, overlay, pointer-events',
+        'color, background-color, border-color, outline-color, text-decoration-color, fill, stroke, --tw-gradient-from, --tw-gradient-via, --tw-gradient-to, opacity, box-shadow, transform, translate, scale, rotate, filter, -webkit-backdrop-filter, backdrop-filter, display, content-visibility, overlay, pointer-events',
       themeKeys: ['--transition-property'],
       handle: (value) => [
         decl('transition-property', value),