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tailwindcss/integrations/postcss/next.test.ts
Philipp Spiess 156afc6d67
Improve compatibility with Safari 15 (#17435) 
This PR improves the compatibility with Tailwind CSS v4 with unsupported
browsers with the goal to greatly improve compatibility with Safari 15.

To make this work, this PR makes the following changes to all code

- Change `oklab(…)` default theme values to use a percentage in the
first place (so instead of `--color-red-500: oklch(0.637 0.237 25.331);`
we now define it as `--color-red-500: oklch(63.7% 0.237 25.331);` since
this syntax has much broader support on Safari).
- Polyfill `@property` with a `@supports` query targeting older versions
of Safari and Firefox *
- Create fallbacks for the `color-mix(…)` function that use _inlined
color values from your theme_ so that they can be computed a compile
time by `lightningcss`. These fallbacks will convert to srgb to increase
compatibility.
- Create fallbacks for the _relative color_ feature used in the new
shadow utilities and using `color-mix(…)` in case _relative color_ is
applied on `currentcolor` (due to limited browser support)
- Create fallbacks for gradient interpolation methods (e.g. to support
`bg-linear-to-r/oklab`)
- Polyfill `@media` queries range syntax.

## A simplified example

Given this example CSS input:

```css
@import 'tailwindcss';
@source inline('from-cyan-500/50 bg-linear-45');
```

Here's the updated output CSS including the newly added polyfills and
updated `oklab` values:

```css
.bg-linear-45 {
  --tw-gradient-position: 45deg;
  background-image: linear-gradient(var(--tw-gradient-stops));
}

@supports (background-image: linear-gradient(in lab, red, red)) {
  .bg-linear-45 {
    --tw-gradient-position: 45deg in oklab;
  }
}

.from-cyan-500\\/50 {
  --tw-gradient-from: oklab(71.5% -.11682 -.08247 / .5);
  --tw-gradient-stops: var(--tw-gradient-via-stops, var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-to) var(--tw-gradient-to-position));
}

@supports (color: color-mix(in lab, red, red)) {
  .from-cyan-500\\/50 {
    --tw-gradient-from: color-mix(in oklab, var(--color-cyan-500) 50%, transparent);
  }
}

:root, :host {
  --color-cyan-500: oklch(71.5% .143 215.221);
}

@supports (((-webkit-hyphens: none)) and (not (margin-trim: 1lh))) or ((-moz-orient: inline) and (not (color: rgb(from red r g b)))) {
  @layer base {
    *, :before, :after, ::backdrop {
      --tw-gradient-position: initial;
      --tw-gradient-from: #0000;
      --tw-gradient-via: #0000;
      --tw-gradient-to: #0000;
      --tw-gradient-stops: initial;
      --tw-gradient-via-stops: initial;
      --tw-gradient-from-position: 0%;
      --tw-gradient-via-position: 50%;
      --tw-gradient-to-position: 100%;
    }
  }
}

@property --tw-gradient-position {
  syntax: "*";
  inherits: false
}

@property --tw-gradient-from {
  syntax: "<color>";
  inherits: false;
  initial-value: #0000;
}

@property --tw-gradient-via {
  syntax: "<color>";
  inherits: false;
  initial-value: #0000;
}

@property --tw-gradient-to {
  syntax: "<color>";
  inherits: false;
  initial-value: #0000;
}

@property --tw-gradient-stops {
  syntax: "*";
  inherits: false
}

@property --tw-gradient-via-stops {
  syntax: "*";
  inherits: false
}

@property --tw-gradient-from-position {
  syntax: "<length-percentage>";
  inherits: false;
  initial-value: 0%;
}

@property --tw-gradient-via-position {
  syntax: "<length-percentage>";
  inherits: false;
  initial-value: 50%;
}

@property --tw-gradient-to-position {
  syntax: "<length-percentage>";
  inherits: false;
  initial-value: 100%;
}
```

## \* A note on `@property` polyfills and CSS modules

On Next.js, CSS module files are required to be _pure_, meaning that all
selectors must either be scoped to a class or an ID. Fortunatnyl for us,
this does not apply to `@property` rules which we've been using before
to initialize CSS variables.

However, since we're now bringing back the `@property` polyfills, that
would cause unexpected rules to be exported from the CSS file as this:

```css
@reference "tailwindcss";

.skew {
  @apply skew-7;
}
```

Would turn to the following file:

```css
.skew {
  /* … */
}
@supports (/*…*/) {
  @layer base {
    *, :before, :after, ::backdrop {
      --tw-gradient-position: initial;
    }
  }
}
@property /* … */ 
```

Notice that this adds a `*` selector which is not considered pure.

Unfortunately there is no way for us to silence this warning or work
around it, as the dependency causing this errors
([`postcss-modules-local-by-default`](https://github.com/css-modules/postcss-modules-local-by-default))
is bundled into Next.js. To work around crashes, these polyfills will
not apply to CSS modules processed by the PostCSS extension for now.

## Testing on tailwindcss.com

To see the changes in effect, take a look at this screencast that
compares tailwindcss.com on iOS 15.5 with a version that has the patches
of this PR applied:

https://github.com/user-attachments/assets/1279d6f5-3c63-4f30-839c-198a789f4292

## Test plan

- Tested on tailwindcss.com via a preview build:
https://tailwindcss-com-git-legacy-browsers-tailwindlabs.vercel.app/
- Updated tests
- Ensure we also test on Chrome 111, Safari 16.4, Firefox 128 to
make sure we have no regressions. Also tested on Safari 16.4, 15.5, 18.0
2025-04-01 13:33:22 +02:00

359 lines
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import { describe } from 'vitest'
import { candidate, css, fetchStyles, js, json, retryAssertion, test } from '../utils'
test(
'production build',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
import styles from './page.module.css'
export default function Page() {
return (
<h1 className={styles.heading + ' text-3xl font-bold underline'}>Hello, Next.js!</h1>
)
}
`,
'app/page.module.css': css`
@reference './globals.css';
.heading {
@apply text-red-500 animate-ping skew-7;
}
`,
'app/globals.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ fs, exec, expect }) => {
await exec('pnpm next build')
let files = await fs.glob('.next/static/css/**/*.css')
expect(files).toHaveLength(2)
let globalCss: string | null = null
let moduleCss: string | null = null
for (let [filename, content] of files) {
if (content.includes('@keyframes page_ping')) moduleCss = filename
else globalCss = filename
}
await fs.expectFileToContain(globalCss!, [
candidate`underline`,
candidate`font-bold`,
candidate`text-3xl`,
])
await fs.expectFileToContain(moduleCss!, [
'color:var(--color-red-500,oklch(63.7% .237 25.331)',
'animation:var(--animate-ping,ping 1s cubic-bezier(0,0,.2,1) infinite)',
/@keyframes page_ping.*{75%,to{transform:scale\(2\);opacity:0}/,
'--tw-skew-x:skewX(7deg);',
])
},
)
describe.each(['turbo', 'webpack'])('%s', (bundler) => {
test(
'dev mode',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
import styles from './page.module.css'
export default function Page() {
return <h1 className={styles.heading + ' underline'}>Hello, Next.js!</h1>
}
`,
'app/page.module.css': css`
@reference './globals.css';
.heading {
@apply text-red-500 animate-ping skew-7 content-['module'];
}
`,
'app/globals.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ fs, spawn, expect }) => {
let process = await spawn(`pnpm next dev ${bundler === 'turbo' ? '--turbo' : ''}`)
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)/.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await process.onStdout((m) => m.includes('Ready in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`underline`)
expect(css).toContain('content: var(--tw-content)')
expect(css).toContain('@keyframes')
})
await fs.write(
'app/page.js',
js`
import styles from './page.module.css'
export default function Page() {
return <h1 className={styles.heading + ' underline bg-red-500'}>Hello, Next.js!</h1>
}
`,
)
await process.onStdout((m) => m.includes('Compiled in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`underline`)
expect(css).toContain(candidate`bg-red-500`)
expect(css).toContain('--tw-skew-x: skewX(7deg);')
expect(css).toContain('content: var(--tw-content)')
expect(css).toContain('@keyframes')
})
},
)
})
test(
'should scan dynamic route segments',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/a/[slug]/page.js': js`
export default function Page() {
return <h1 className="content-['[slug]']">Hello, Next.js!</h1>
}
`,
'app/b/[...slug]/page.js': js`
export default function Page() {
return <h1 className="content-['[...slug]']">Hello, Next.js!</h1>
}
`,
'app/c/[[...slug]]/page.js': js`
export default function Page() {
return <h1 className="content-['[[...slug]]']">Hello, Next.js!</h1>
}
`,
'app/d/(theme)/page.js': js`
export default function Page() {
return <h1 className="content-['(theme)']">Hello, Next.js!</h1>
}
`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/globals.css': css`
@import 'tailwindcss/utilities' source(none);
@source './**/*.{js,ts,jsx,tsx,mdx}';
`,
},
},
async ({ fs, exec, expect }) => {
await exec('pnpm next build')
let files = await fs.glob('.next/static/css/**/*.css')
expect(files).toHaveLength(1)
let [filename] = files[0]
await fs.expectFileToContain(filename, [
candidate`content-['[slug]']`,
candidate`content-['[...slug]']`,
candidate`content-['[[...slug]]']`,
candidate`content-['(theme)']`,
])
},
)
test(
'changes to CSS files should pick up new CSS variables (if any)',
{
fs: {
'package.json': json`
{
"dependencies": {
"react": "^18",
"react-dom": "^18",
"next": "^14"
},
"devDependencies": {
"@tailwindcss/postcss": "workspace:^",
"tailwindcss": "workspace:^"
}
}
`,
'postcss.config.mjs': js`
export default {
plugins: {
'@tailwindcss/postcss': {},
},
}
`,
'next.config.mjs': js`export default {}`,
'app/layout.js': js`
import './globals.css'
export default function RootLayout({ children }) {
return (
<html>
<body>{children}</body>
</html>
)
}
`,
'app/page.js': js`
export default function Page() {
return <div className="flex"></div>
}
`,
'unrelated.module.css': css`
.module {
color: var(--color-blue-500);
}
`,
'app/globals.css': css`
@import 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
},
},
async ({ spawn, exec, fs, expect }) => {
// Generate the initial build so output CSS files exist on disk
await exec('pnpm next build')
// NOTE: We are writing to an output CSS file which is not being ignored by
// `.gitignore` nor marked with `@source not`. This should not result in an
// infinite loop.
let process = await spawn(`pnpm next dev`)
let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)/.exec(m)
if (match) url = match[1]
return Boolean(url)
})
await process.onStdout((m) => m.includes('Ready in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).toContain('--color-blue-500:')
expect(css).not.toContain('--color-red-500:')
})
await fs.write(
'unrelated.module.css',
css`
.module {
color: var(--color-blue-500);
background-color: var(--color-red-500);
}
`,
)
await process.onStdout((m) => m.includes('Compiled in'))
await retryAssertion(async () => {
let css = await fetchStyles(url)
expect(css).toContain(candidate`flex`)
expect(css).toContain('--color-blue-500:')
expect(css).toContain('--color-red-500:')
})
},
)
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