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philipp-spiessadamwathan
philipp-spiess
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adamwathan
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Reintroduce container component as a utility (#14993)
Closes #13129 We're adding back the v3 `container` component, this time as a utility. The idea is that we support the default `container` behavior but we will not have an API to configure this similar to what v3 offered. Instead, the recommended approach is to configure it by creating a custom utility like so: ```css @import "tailwindcss"; @Utility container { margin-left: auto; margin-right: auto; padding-left: 2rem; padding-right: 2rem; } ``` We do have an idea of how to migrate existing JS configuration files to the new `@utility` as part of the interop layer and the codemod. This is going to be a follow-up PR though. ## Test Plan We added a unit test but we've also played around with it in the Vite playground. Yep, looks like a `container`: https://github.com/user-attachments/assets/ea7a5a4c-4cde-4ef5-9062-03e16239eb85 --------- Co-authored-by: Adam Wathan <[email protected]>
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‎CHANGELOG.md

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@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Support opacity values in increments of `0.25` by default ([#14980](https://github.com/tailwindlabs/tailwindcss/pull/14980))
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- Support specifying the color interpolation method for gradients via modifier ([#14984](https://github.com/tailwindlabs/tailwindcss/pull/14984))
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- Reintroduce `container` component as a utility ([#14993](https://github.com/tailwindlabs/tailwindcss/pull/14993))
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### Fixed
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‎packages/tailwindcss/src/__snapshots__/intellisense.test.ts.snap

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@@ -3375,6 +3375,7 @@ exports[`getClassList 1`] = `
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"contain-size",
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"contain-strict",
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"contain-style",
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"container",
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"content-around",
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"content-baseline",
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"content-between",

‎packages/tailwindcss/src/property-order.ts

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@@ -28,6 +28,10 @@ export default [
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'float',
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'clear',
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// Ensure that the included `container` class is always sorted before any
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// custom container extensions
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'--tw-container-component',
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// How do we make `mx-0` come before `mt-0`?
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// Idea: `margin-x` property that we compile away with a Visitor plugin?
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'margin',

‎packages/tailwindcss/src/utilities.test.ts

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@@ -3148,6 +3148,230 @@ test('max-height', async () => {
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).toEqual('')
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})
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describe('container', () => {
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test('creates the right media queries and sorts it before width', async () => {
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expect(
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await compileCss(
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css`
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@theme {
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--breakpoint-sm: 40rem;
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--breakpoint-md: 48rem;
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--breakpoint-lg: 64rem;
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--breakpoint-xl: 80rem;
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--breakpoint-2xl: 96rem;
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}
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@tailwind utilities;
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`,
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['w-1/2', 'container', 'max-w-[var(--breakpoint-sm)]'],
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),
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).toMatchInlineSnapshot(`
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":root {
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--breakpoint-sm: 40rem;
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--breakpoint-md: 48rem;
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--breakpoint-lg: 64rem;
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--breakpoint-xl: 80rem;
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--breakpoint-2xl: 96rem;
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}
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.container {
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width: 100%;
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}
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@media (width >= 40rem) {
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.container {
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max-width: 40rem;
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}
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}
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@media (width >= 48rem) {
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.container {
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max-width: 48rem;
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}
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}
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@media (width >= 64rem) {
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.container {
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max-width: 64rem;
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}
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}
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@media (width >= 80rem) {
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.container {
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max-width: 80rem;
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}
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}
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@media (width >= 96rem) {
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.container {
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max-width: 96rem;
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}
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}
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.w-1\\/2 {
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width: 50%;
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}
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.max-w-\\[var\\(--breakpoint-sm\\)\\] {
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max-width: var(--breakpoint-sm);
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}"
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`)
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})
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test('sorts breakpoints based on unit and then in ascending aOrder', async () => {
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expect(
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await compileCss(
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css`
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@theme reference {
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--breakpoint-lg: 64rem;
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--breakpoint-xl: 80rem;
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--breakpoint-3xl: 1600px;
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--breakpoint-sm: 40em;
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--breakpoint-2xl: 96rem;
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--breakpoint-xs: 30px;
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--breakpoint-md: 48em;
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}
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@tailwind utilities;
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`,
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['container'],
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),
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).toMatchInlineSnapshot(`
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".container {
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width: 100%;
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}
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@media (width >= 40em) {
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.container {
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max-width: 40em;
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}
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}
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@media (width >= 48em) {
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.container {
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max-width: 48em;
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}
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}
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@media (width >= 30px) {
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.container {
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max-width: 30px;
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}
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}
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@media (width >= 1600px) {
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.container {
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max-width: 1600px;
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}
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}
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@media (width >= 64rem) {
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.container {
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max-width: 64rem;
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}
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}
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@media (width >= 80rem) {
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.container {
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max-width: 80rem;
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}
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}
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@media (width >= 96rem) {
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.container {
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max-width: 96rem;
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}
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}"
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`)
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})
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test('custom `@utility container` always follow the core utility ', async () => {
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expect(
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await compileCss(
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css`
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@theme {
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--breakpoint-sm: 40rem;
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--breakpoint-md: 48rem;
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--breakpoint-lg: 64rem;
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--breakpoint-xl: 80rem;
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--breakpoint-2xl: 96rem;
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}
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@tailwind utilities;
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@utility container {
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margin-inline: auto;
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padding-inline: 1rem;
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@media (width >= theme(--breakpoint-sm)) {
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padding-inline: 2rem;
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}
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}
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`,
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['w-1/2', 'container', 'max-w-[var(--breakpoint-sm)]'],
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),
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).toMatchInlineSnapshot(`
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":root {
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--breakpoint-sm: 40rem;
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--breakpoint-md: 48rem;
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--breakpoint-lg: 64rem;
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--breakpoint-xl: 80rem;
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--breakpoint-2xl: 96rem;
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}
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.container {
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width: 100%;
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}
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@media (width >= 40rem) {
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.container {
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max-width: 40rem;
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}
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}
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@media (width >= 48rem) {
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.container {
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max-width: 48rem;
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}
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}
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@media (width >= 64rem) {
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.container {
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max-width: 64rem;
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}
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}
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@media (width >= 80rem) {
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.container {
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max-width: 80rem;
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}
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}
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@media (width >= 96rem) {
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.container {
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max-width: 96rem;
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}
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}
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.container {
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margin-inline: auto;
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padding-inline: 1rem;
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}
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@media (width >= 40rem) {
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.container {
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padding-inline: 2rem;
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}
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}
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.w-1\\/2 {
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width: 50%;
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}
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.max-w-\\[var\\(--breakpoint-sm\\)\\] {
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max-width: var(--breakpoint-sm);
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}"
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`)
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})
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})
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test('flex', async () => {
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expect(
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await run([
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`)
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})
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test('only multiples of 0.25 with no trailing zeroes are supported with the spacing multipler', async () => {
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test('only multiples of 0.25 with no trailing zeroes are supported with the spacing multiplier', async () => {
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let { build } = await compile(css`
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@theme {
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--spacing: 4px;

‎packages/tailwindcss/src/utilities.ts

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import { atRoot, atRule, decl, styleRule, type AstNode } from './ast'
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import type { Candidate, CandidateModifier, NamedUtilityValue } from './candidate'
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import type { Theme, ThemeKey } from './theme'
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import { compareBreakpoints } from './utils/compare-breakpoints'
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import { DefaultMap } from './utils/default-map'
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import {
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inferDataType,
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})
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}
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utilities.static('container', () => {
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let breakpoints = [...theme.namespace('--breakpoint').values()]
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breakpoints.sort((a, z) => compareBreakpoints(a, z, 'asc'))
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let decls: AstNode[] = [decl('--tw-sort', '--tw-container-component'), decl('width', '100%')]
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for (let breakpoint of breakpoints) {
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decls.push(atRule('@media', `(min-width: ${breakpoint})`, [decl('max-width', breakpoint)]))
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}
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return decls
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})
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/**
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* @css `flex`
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*/

‎packages/tailwindcss/src/utils/compare-breakpoints.ts

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export function compareBreakpoints(a: string, z: string, direction: 'asc' | 'desc') {
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if (a === z) return 0
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// Assumption: when a `(` exists, we are dealing with a CSS function.
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//
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// E.g.: `calc(100% - 1rem)`
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let aIsCssFunction = a.indexOf('(')
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let zIsCssFunction = z.indexOf('(')
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let aBucket =
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aIsCssFunction === -1
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? // No CSS function found, bucket by unit instead
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a.replace(/[\d.]+/g, '')
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: // CSS function found, bucket by function name
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a.slice(0, aIsCssFunction)
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let zBucket =
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zIsCssFunction === -1
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? // No CSS function found, bucket by unit
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z.replace(/[\d.]+/g, '')
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: // CSS function found, bucket by function name
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z.slice(0, zIsCssFunction)
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let order =
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// Compare by bucket name
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(aBucket === zBucket ? 0 : aBucket < zBucket ? -1 : 1) ||
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// If bucket names are the same, compare by value
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(direction === 'asc' ? parseInt(a) - parseInt(z) : parseInt(z) - parseInt(a))
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// If the groups are the same, and the contents are not numbers, the
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// `order` will result in `NaN`. In this case, we want to make sorting
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// stable by falling back to a string comparison.
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//
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// This can happen when using CSS functions such as `calc`.
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//
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// E.g.:
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//
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// - `min-[calc(100%-1rem)]` and `min-[calc(100%-2rem)]`
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// - `@[calc(100%-1rem)]` and `@[calc(100%-2rem)]`
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//
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// In this scenario, we want to alphabetically sort `calc(100%-1rem)` and
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// `calc(100%-2rem)` to make it deterministic.
43+
if (Number.isNaN(order)) {
44+
return a < z ? -1 : 1
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}
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return order
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}

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