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fix fallbacks for at-property and at-keyframes #1902

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Merged
romainmenke merged 3 commits into from
Sep 6, 2026
Merged

fix fallbacks for at-property and at-keyframes #1902

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69c636d
fix fallbacks for at-property and at-keyframes
romainmenke Sep 6, 2026
6382fed
fix all other plugins
romainmenke Sep 6, 2026
9be4328
fix
romainmenke Sep 6, 2026
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11 changes: 11 additions & 0 deletions plugins/postcss-alpha-function/test/basic.css
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Expand Up @@ -80,3 +80,14 @@
color-1: alpha(from color(srgb srgb-linear 0.5 1 0) / calc(alpha / 2));
color-2: alpha(from color(var(--foo) 0.5 1 0) / calc(alpha / 2));
}

@property --foo {
inherits: false;
initial-value: alpha(from oklch(2 1 0) / calc(alpha / 2));
}

@keyframes --foo {
to {
--color: alpha(from oklch(2 1 0) / calc(alpha / 2));
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-alpha-function/test/basic.expect.css
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Expand Up @@ -80,3 +80,14 @@
color-1: alpha(from color(srgb srgb-linear 0.5 1 0) / calc(alpha / 2));
color-2: alpha(from color(var(--foo) 0.5 1 0) / calc(alpha / 2));
}

@property --foo {
inherits: false;
initial-value: oklch(from oklch(2 1 0) l c h / calc(alpha / 2));
}

@keyframes --foo {
to {
--color: oklch(from oklch(2 1 0) l c h / calc(alpha / 2));
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-alpha-function/test/basic.preserve-true.expect.css
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Expand Up @@ -161,3 +161,31 @@
color-1: alpha(from color(srgb srgb-linear 0.5 1 0) / calc(alpha / 2));
color-2: alpha(from color(var(--foo) 0.5 1 0) / calc(alpha / 2));
}

@property --foo {
inherits: false;
initial-value: oklch(from oklch(2 1 0) l c h / calc(alpha / 2));
}

@supports (color: alpha(from red / 1)) and (color: oklab(0% 0 0%)) {
@property --foo {
inherits: false;
initial-value: alpha(from oklch(2 1 0) / calc(alpha / 2));
}
}

@keyframes --foo {
to {
--color: oklch(from oklch(2 1 0) l c h / calc(alpha / 2));
}
}

@supports (color: alpha(from red / 1)) and (color: oklab(0% 0 0%)) {

@keyframes --foo {
to {
--color: oklch(from oklch(2 1 0) l c h / calc(alpha / 2));
--color: alpha(from oklch(2 1 0) / calc(alpha / 2));
}
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-function-display-p3-linear/test/basic.css
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Expand Up @@ -23,3 +23,14 @@
to-clone {
color: color(display-p3-linear 1 0 0);
}

@property --foo {
inherits: false;
initial-value: color(display-p3-linear 0.1 0.1 0.1);
}

@keyframes --foo {
to {
--color: color(display-p3-linear 0.1 0.1 0.1);
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-function-display-p3-linear/test/basic.expect.css
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Expand Up @@ -23,3 +23,14 @@
to-clone {
color: color(display-p3 1 0 0);
}

@property --foo {
inherits: false;
initial-value: color(display-p3 0.34919 0.34919 0.34919);
}

@keyframes --foo {
to {
--color: color(display-p3 0.34919 0.34919 0.34919);
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-function-display-p3-linear/test/basic.preserve-true.expect.css
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Expand Up @@ -27,3 +27,31 @@ to-clone {
color: color(display-p3 1 0 0);
color: color(display-p3-linear 1 0 0);
}

@property --foo {
inherits: false;
initial-value: color(display-p3 0.34919 0.34919 0.34919);
}

@supports (color: color(display-p3-linear 0 0 0)) {
@property --foo {
inherits: false;
initial-value: color(display-p3-linear 0.1 0.1 0.1);
}
}

@keyframes --foo {
to {
--color: color(display-p3 0.34919 0.34919 0.34919);
}
}

@supports (color: color(display-p3-linear 0 0 0)) {

@keyframes --foo {
to {
--color: color(display-p3 0.34919 0.34919 0.34919);
--color: color(display-p3-linear 0.1 0.1 0.1);
}
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-function-display-p3-linear/test/basic.with-cloned-rules.expect.css
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Expand Up @@ -32,3 +32,31 @@ to-clone {
color: color(display-p3 1 0 0);
color: color(display-p3-linear 1 0 0);
}

@property --foo {
inherits: false;
initial-value: color(display-p3 0.34919 0.34919 0.34919);
}

@supports (color: color(display-p3-linear 0 0 0)) {
@property --foo {
inherits: false;
initial-value: color(display-p3-linear 0.1 0.1 0.1);
}
}

@keyframes --foo {
to {
--color: color(display-p3 0.34919 0.34919 0.34919);
}
}

@supports (color: color(display-p3-linear 0 0 0)) {

@keyframes --foo {
to {
--color: color(display-p3 0.34919 0.34919 0.34919);
--color: color(display-p3-linear 0.1 0.1 0.1);
}
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-function/test/basic.css
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Expand Up @@ -221,3 +221,14 @@
to-clone {
color: color(display-p3 1 0 0);
}

@property --foo {
inherits: false;
initial-value: color(display-p3 0.1 0.1 0.1);
}

@keyframes --foo {
to {
--color: color(display-p3 0.1 0.1 0.1);
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-function/test/basic.expect.css
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Expand Up @@ -221,3 +221,14 @@
to-clone {
color: rgb(255, 52, 40);
}

@property --foo {
inherits: false;
initial-value: rgb(26, 26, 26);
}

@keyframes --foo {
to {
--color: rgb(26, 26, 26);
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-function/test/basic.preserve-true.expect.css
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Expand Up @@ -324,3 +324,31 @@ to-clone {
color: rgb(255, 52, 40);
color: color(display-p3 1 0 0);
}

@property --foo {
inherits: false;
initial-value: rgb(26, 26, 26);
}

@supports (color: color(display-p3 0 0 0%)) {
@property --foo {
inherits: false;
initial-value: color(display-p3 0.1 0.1 0.1);
}
}

@keyframes --foo {
to {
--color: rgb(26, 26, 26);
}
}

@supports (color: color(display-p3 0 0 0%)) {

@keyframes --foo {
to {
--color: rgb(26, 26, 26);
--color: color(display-p3 0.1 0.1 0.1);
}
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-function/test/basic.with-cloned-rules.expect.css
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Expand Up @@ -329,3 +329,31 @@ to-clone {
color: rgb(255, 52, 40);
color: color(display-p3 1 0 0);
}

@property --foo {
inherits: false;
initial-value: rgb(26, 26, 26);
}

@supports (color: color(display-p3 0 0 0%)) {
@property --foo {
inherits: false;
initial-value: color(display-p3 0.1 0.1 0.1);
}
}

@keyframes --foo {
to {
--color: rgb(26, 26, 26);
}
}

@supports (color: color(display-p3 0 0 0%)) {

@keyframes --foo {
to {
--color: rgb(26, 26, 26);
--color: color(display-p3 0.1 0.1 0.1);
}
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-functional-notation/test/basic.css
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Expand Up @@ -106,3 +106,14 @@
to-clone {
color: rgb(255 0 0);
}

@property --foo {
inherits: false;
initial-value: rgb(255 0 0);
}

@keyframes --foo {
to {
--color: rgb(255 0 0);
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-functional-notation/test/basic.expect.css
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Expand Up @@ -106,3 +106,14 @@
to-clone {
color: rgb(255, 0, 0);
}

@property --foo {
inherits: false;
initial-value: rgb(255, 0, 0);
}

@keyframes --foo {
to {
--color: rgb(255, 0, 0);
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-functional-notation/test/basic.preserve-true.expect.css
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Expand Up @@ -168,3 +168,31 @@ to-clone {
color: rgb(255, 0, 0);
color: rgb(255 0 0);
}

@property --foo {
inherits: false;
initial-value: rgb(255, 0, 0);
}

@supports (color: rgb(0 0 0 / 0)) {
@property --foo {
inherits: false;
initial-value: rgb(255 0 0);
}
}

@keyframes --foo {
to {
--color: rgb(255, 0, 0);
}
}

@supports (color: rgb(0 0 0 / 0)) {

@keyframes --foo {
to {
--color: rgb(255, 0, 0);
--color: rgb(255 0 0);
}
}
}
28 changes: 28 additions & 0 deletions plugins/postcss-color-functional-notation/test/basic.with-cloned-rules.expect.css
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Expand Up @@ -173,3 +173,31 @@ to-clone {
color: rgb(255, 0, 0);
color: rgb(255 0 0);
}

@property --foo {
inherits: false;
initial-value: rgb(255, 0, 0);
}

@supports (color: rgb(0 0 0 / 0)) {
@property --foo {
inherits: false;
initial-value: rgb(255 0 0);
}
}

@keyframes --foo {
to {
--color: rgb(255, 0, 0);
}
}

@supports (color: rgb(0 0 0 / 0)) {

@keyframes --foo {
to {
--color: rgb(255, 0, 0);
--color: rgb(255 0 0);
}
}
}
4 changes: 4 additions & 0 deletions plugins/postcss-color-hex-alpha/CHANGELOG.md
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@@ -1,5 +1,9 @@
# Changes to PostCSS Color Hex Alpha

### Unreleased (patch)

- Ignore `initial-value` in `@property`

### 11.0.0

_January 14, 2026_
Expand Down
2 changes: 1 addition & 1 deletion plugins/postcss-color-hex-alpha/dist/index.mjs
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@@ -1 +1 @@
import e from"postcss-value-parser";import{hasFallback as s}from"@csstools/utilities";const creator=a=>{const o=Object.assign({preserve:!1},a);return{postcssPlugin:"postcss-color-hex-alpha",Declaration(a){if(!t.test(a.value))return;if(s(a))return;const{value:l}=a,n=e(l);n.walk(e=>{if("function"===e.type&&"url"===e.value)return!1;"word"===e.type&&r.test(e.value)&&hexa2rgba(e)});const c=n.toString();c!==l&&(a.cloneBefore({value:c}),o.preserve||a.remove())}}};creator.postcss=!0;const t=/#[0-9a-f]{4}(?:[0-9a-f]{4})?\b/i,r=/^#[0-9a-f]{4}(?:[0-9a-f]{4})?$/i,a=1e5,o=/[0-9a-f]/gi;function hexa2rgba(e){const s=e.value,t=`0x${5===s.length?s.slice(1).replace(o,"$&$&"):s.slice(1)}`,[r,l,n,c]=[parseInt(t.slice(2,4),16),parseInt(t.slice(4,6),16),parseInt(t.slice(6,8),16),Math.round(parseInt(t.slice(8,10),16)/255*a)/a];e.value=`rgba(${r},${l},${n},${c})`}export{creator as default,creator as"module.exports"};
import e from"postcss-value-parser";import{hasFallback as t}from"@csstools/utilities";const creator=a=>{const o=Object.assign({preserve:!1},a);return{postcssPlugin:"postcss-color-hex-alpha",Declaration(a){if(!r.test(a.value))return;if(t(a))return;if("atrule"===a.parent?.type&&"property"===a.parent.name.toLowerCase())return;const{value:n}=a,l=e(n);l.walk(e=>{if("function"===e.type&&"url"===e.value)return!1;"word"===e.type&&s.test(e.value)&&hexa2rgba(e)});const c=l.toString();c!==n&&(a.cloneBefore({value:c}),o.preserve||a.remove())}}};creator.postcss=!0;const r=/#[0-9a-f]{4}(?:[0-9a-f]{4})?\b/i,s=/^#[0-9a-f]{4}(?:[0-9a-f]{4})?$/i,a=1e5,o=/[0-9a-f]/gi;function hexa2rgba(e){const t=e.value,r=`0x${5===t.length?t.slice(1).replace(o,"$&$&"):t.slice(1)}`,[s,n,l,c]=[parseInt(r.slice(2,4),16),parseInt(r.slice(4,6),16),parseInt(r.slice(6,8),16),Math.round(parseInt(r.slice(8,10),16)/255*a)/a];e.value=`rgba(${s},${n},${l},${c})`}export{creator as default,creator as"module.exports"};
4 changes: 4 additions & 0 deletions plugins/postcss-color-hex-alpha/src/index.ts
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Expand Up @@ -29,6 +29,10 @@ const creator: PluginCreator<pluginOptions> = (opts?: pluginOptions) => {
return;
}

if (decl.parent?.type === 'atrule' && decl.parent.name.toLowerCase() === 'property') {
return;
}

const { value: originalValue } = decl;

// replace instances of hexa with rgba()
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11 changes: 11 additions & 0 deletions plugins/postcss-color-hex-alpha/test/basic.css
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Expand Up @@ -23,3 +23,14 @@ body {
to-clone {
color: #9823f8a9;
}

@property --foo {
inherits: false;
initial-value: #9823f8a9;
}

@keyframes --foo {
to {
--color: #9823f8a9;
}
}
11 changes: 11 additions & 0 deletions plugins/postcss-color-hex-alpha/test/basic.expect.css
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Expand Up @@ -23,3 +23,14 @@ body {
to-clone {
color: rgba(152,35,248,0.66275);
}

@property --foo {
inherits: false;
initial-value: #9823f8a9;
}

@keyframes --foo {
to {
--color: rgba(152,35,248,0.66275);
}
}
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