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+[
+ {
+ "id": "all-property",
+ "title": "`all` Property",
+ "description": "A property for defining the reset of all properties of an element",
+ "specification": "https://www.w3.org/TR/css-cascade-3/#all-shorthand",
+ "stage": 4,
+ "browser_support": {
+ "and_chr": "37",
+ "and_ff": "27",
+ "android": "37",
+ "chrome": "37",
+ "edge": "79",
+ "firefox": "27",
+ "ios_saf": "9.3",
+ "oculus": "5.0",
+ "op_mob": "24",
+ "opera": "24",
+ "safari": "9.1",
+ "samsung": "3.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/all"
+ },
+ "example": "a {\n all: initial;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/maximkoretskiy/postcss-initial"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "any-link-pseudo-class",
+ "title": "`:any-link` Hyperlink Pseudo-Class",
+ "description": "A pseudo-class for matching anchor elements independent of whether they have been visited",
+ "specification": "https://www.w3.org/TR/selectors-4/#any-link-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "18",
+ "and_ff": "4",
+ "android": "37",
+ "chrome": "1",
+ "edge": "79",
+ "firefox": "1",
+ "ios_saf": "1",
+ "oculus": "5.0",
+ "op_mob": "14",
+ "opera": "15",
+ "safari": "3",
+ "samsung": "1.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:any-link"
+ },
+ "example": "nav :any-link > span {\n background-color: yellow;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-pseudo-class-any-link"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "blank-pseudo-class",
+ "title": "`:blank` Empty-Value Pseudo-Class",
+ "description": "A pseudo-class for matching form elements when they are empty",
+ "specification": "https://www.w3.org/TR/selectors-4/#blank",
+ "stage": 2,
+ "browser_support": {},
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:blank"
+ },
+ "example": "input:blank {\n background-color: yellow;\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-blank-pseudo"
+ },
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-blank-pseudo"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "break-properties",
+ "title": "Break Properties",
+ "description": "Properties for defining the break behavior between and within boxes",
+ "specification": "https://www.w3.org/TR/css-break-3/#breaking-controls",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "51",
+ "and_ff": "92",
+ "android": "51",
+ "chrome": "51",
+ "edge": "12",
+ "firefox": "92",
+ "oculus": "5.0",
+ "op_mob": "37",
+ "opera": "11.1",
+ "samsung": "5.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/break-after"
+ },
+ "example": "a {\n break-inside: avoid;\n break-before: avoid-column;\n break-after: always;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/shrpne/postcss-page-break"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "calc-constants",
+ "title": "`e`, `pi`, `infinity`, `-infinity` and `NaN` constants for calculation",
+ "description": "Constants for calculation simplification",
+ "specification": "https://www.w3.org/TR/css-values-4/#calc-constants",
+ "stage": 2,
+ "browser_support": {},
+ "example": "p {\n font-size: calc(pow(e, pi) * 1rem);\n}",
+ "vendors_implementations": 0
+ },
+ {
+ "id": "cascade-layers",
+ "title": "CSS Cascade Layers",
+ "description": "The `@layer` at-rule allows authors to explicitly layer their styles in the cascade, before specificity and order of appearance are considered.",
+ "specification": "https://www.w3.org/TR/css-cascade-5/#layering",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "99",
+ "and_ff": "97",
+ "android": "99",
+ "chrome": "99",
+ "edge": "99",
+ "firefox": "97",
+ "ios_saf": "15.4",
+ "oculus": "21.0",
+ "op_mob": "68",
+ "opera": "85",
+ "safari": "15.4",
+ "samsung": "18.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/@layer"
+ },
+ "example": "/* Un-layered styles have the highest priority */\na {\n color: mediumvioletred;\n}\n\n@layer defaults {\n a { color: maroon; }\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-cascade-layers"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "case-insensitive-attributes",
+ "title": "Case-Insensitive Attributes",
+ "description": "An attribute selector matching attribute values case-insensitively",
+ "specification": "https://www.w3.org/TR/selectors-4/#attribute-case",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "49",
+ "and_ff": "47",
+ "android": "49",
+ "chrome": "49",
+ "edge": "79",
+ "firefox": "47",
+ "ios_saf": "9",
+ "oculus": "5.0",
+ "op_mob": "36",
+ "opera": "36",
+ "safari": "9",
+ "samsung": "5.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors"
+ },
+ "example": "[frame=hsides i] {\n border-style: solid none;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-attribute-case-insensitive"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "clamp",
+ "title": "`clamp` Function",
+ "description": "The clamp() CSS function clamps a value between an upper and lower bound. It enables selecting a middle value within a range of values between a defined minimum and maximum.",
+ "specification": "https://www.w3.org/TR/css-values-4/#funcdef-clamp",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "79",
+ "and_ff": "79",
+ "android": "79",
+ "chrome": "79",
+ "edge": "79",
+ "firefox": "75",
+ "ios_saf": "13.4",
+ "oculus": "8.0",
+ "op_mob": "57",
+ "opera": "66",
+ "safari": "13.1",
+ "samsung": "12.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/clamp()"
+ },
+ "example": "button {\n font-size: clamp(1rem, 2.5vw, 2rem);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/polemius/postcss-clamp"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "color-adjust",
+ "title": "`color-adjust` Property",
+ "description": "The color-adjust property is a non-standard CSS extension that can be used to force printing of background colors and images",
+ "specification": "https://www.w3.org/TR/css-color-4/#color-adjust",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "97",
+ "firefox": "97",
+ "ios_saf": "15.4",
+ "safari": "15.4"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color-adjust"
+ },
+ "example": ".background {\n background-color:#ccc;\n}\n.background.color-adjust {\n color-adjust: economy;\n}\n.background.color-adjust-exact {\n color-adjust: exact;\n}",
+ "vendors_implementations": 2
+ },
+ {
+ "id": "color-contrast",
+ "title": "`color-contrast()` Function",
+ "description": "A function for choosing the color that contrasts the most.",
+ "specification": "https://drafts.csswg.org/css-color-6/#colorcontrast",
+ "stage": 1,
+ "browser_support": {},
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/color-contrast()"
+ },
+ "example": "p {\n color: color-contrast(wheat vs tan, sienna, var(--myAccent), #d2691e);\n}",
+ "polyfills": [],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "color-function",
+ "title": "`color()` Function",
+ "description": "A function that allows a color to be specified in a particular, specified color space rather than the implicit sRGB color space that most of the other color functions operate in.",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-color",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "113",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "113",
+ "ios_saf": "15",
+ "opera": "97",
+ "safari": "15",
+ "samsung": "22.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/color()"
+ },
+ "example": "p {\n color: color(display-p3 1 0.5 0);\n color: color(display-p3 1 0.5 0 / .5);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "color-functional-notation",
+ "title": "Color Functional Notation",
+ "description": "A space and slash separated notation for specifying colors",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-rgb",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "65",
+ "and_ff": "52",
+ "android": "65",
+ "chrome": "65",
+ "edge": "79",
+ "firefox": "52",
+ "ios_saf": "12.2",
+ "oculus": "5.0",
+ "op_mob": "47",
+ "opera": "52",
+ "safari": "12.1",
+ "samsung": "9.0"
+ },
+ "example": "em {\n background-color: hsl(120deg 100% 25%);\n color: rgb(0 255 0);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-functional-notation"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "color-mix",
+ "title": "`color-mix()` Function",
+ "description": "A function for mixing colors",
+ "specification": "https://www.w3.org/TR/css-color-5/#color-mix",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "113",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "113",
+ "ios_saf": "16.2",
+ "opera": "97",
+ "safari": "16.2",
+ "samsung": "22.0"
+ },
+ "example": "p {\n color: color-mix(in lch, purple 50%, plum 50%);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-mix-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "color-mod-function",
+ "title": "`color-mod()` Function",
+ "description": "A function for modifying colors",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-color-mod",
+ "stage": -1,
+ "browser_support": {},
+ "example": "p {\n color: color-mod(black alpha(50%));\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-color-mod-function"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "container-queries",
+ "title": "Container Queries",
+ "description": "New container property and container at rule to make changes depending on the container's size",
+ "specification": "https://www.w3.org/TR/css-contain-3/#container-queries",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "106",
+ "and_ff": "110",
+ "android": "106",
+ "chrome": "106",
+ "edge": "106",
+ "firefox": "110",
+ "ios_saf": "16",
+ "op_mob": "73",
+ "opera": "94",
+ "safari": "16",
+ "samsung": "20"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Container_Queries"
+ },
+ "example": ".container {\n contain: layout inline-size;\n}\n\n@container (min-width: 700px) {\n .container {\n /* styles applied when a container is at least 700px */\n }\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://www.npmjs.com/package/container-query-polyfill"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "custom-media-queries",
+ "title": "Custom Media Queries",
+ "description": "An at-rule for defining aliases that represent media queries",
+ "specification": "https://www.w3.org/TR/mediaqueries-5/#at-ruledef-custom-media",
+ "stage": 2,
+ "browser_support": {},
+ "example": "@custom-media --narrow-window (max-width: 30em);\n\n@media (--narrow-window) {}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-media"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "custom-properties",
+ "title": "Custom Properties",
+ "description": "A syntax for defining custom values accepted by all CSS properties",
+ "specification": "https://www.w3.org/TR/css-variables-1/",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "49",
+ "and_ff": "31",
+ "android": "50",
+ "chrome": "49",
+ "edge": "15",
+ "firefox": "31",
+ "ios_saf": "9.3",
+ "oculus": "5.0",
+ "op_mob": "36",
+ "opera": "36",
+ "safari": "9.1",
+ "samsung": "5.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/var"
+ },
+ "example": ":root {\n --some-length: 32px;\n\n height: var(--some-length);\n width: var(--some-length);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-properties"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "custom-property-sets",
+ "title": "Custom Property Sets",
+ "description": "A syntax for storing properties in named variables, referenceable in other style rules",
+ "specification": "https://tabatkins.github.io/specs/css-apply-rule/",
+ "stage": -1,
+ "browser_support": {},
+ "example": "img {\n --some-length-styles: {\n height: 32px;\n width: 32px;\n };\n\n @apply --some-length-styles;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/pascalduez/postcss-apply"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "custom-selectors",
+ "title": "Custom Selectors",
+ "description": "An at-rule for defining aliases that represent selectors",
+ "specification": "https://drafts.csswg.org/css-extensions/#custom-selectors",
+ "stage": 1,
+ "browser_support": {},
+ "example": "@custom-selector :--heading h1, h2, h3, h4, h5, h6;\n\narticle :--heading + p {}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-custom-selectors"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "dir-pseudo-class",
+ "title": "`:dir` Directionality Pseudo-Class",
+ "description": "A pseudo-class for matching elements based on their directionality",
+ "specification": "https://www.w3.org/TR/selectors-4/#dir-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "49",
+ "firefox": "49",
+ "ios_saf": "16.4",
+ "safari": "16.4"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:dir"
+ },
+ "example": "blockquote:dir(rtl) {\n margin-right: 10px;\n}\n\nblockquote:dir(ltr) {\n margin-left: 10px;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-dir-pseudo-class"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "display-two-values",
+ "title": "Two values syntax for `display`",
+ "description": "Syntax that allows definition of outer and inner displays types for an element",
+ "specification": "https://www.w3.org/TR/css-display-3/#the-display-properties",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "115",
+ "and_ff": "79",
+ "android": "115",
+ "chrome": "115",
+ "edge": "115",
+ "firefox": "70",
+ "ios_saf": "15",
+ "opera": "101",
+ "safari": "15"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/display/two-value_syntax_of_display"
+ },
+ "example": ".element {\n display: inline flow-root;\n display: inline flex;\n display: block grid;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-normalize-display-values"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "double-position-gradients",
+ "title": "Double Position Gradients",
+ "description": "A syntax for using two positions in a gradient.",
+ "specification": "https://www.w3.org/TR/css-images-4/#color-stop-syntax",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "72",
+ "and_ff": "83",
+ "android": "72",
+ "chrome": "72",
+ "edge": "79",
+ "firefox": "83",
+ "ios_saf": "12.2",
+ "oculus": "6.0",
+ "op_mob": "51",
+ "opera": "60",
+ "safari": "12.1",
+ "samsung": "11.0"
+ },
+ "example": ".pie_chart {\n background-image: conic-gradient(yellowgreen 40%, gold 0deg 75%, #f06 0deg);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-double-position-gradients"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "environment-variables",
+ "title": "Custom Environment Variables",
+ "description": "A syntax for using custom values accepted by CSS globally",
+ "specification": "https://drafts.csswg.org/css-env-1/",
+ "stage": 0,
+ "browser_support": {},
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/env"
+ },
+ "example": "@media (max-width: env(--brand-small)) {\n body {\n padding: env(--brand-spacing);\n }\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-env-function"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "exponential-functions",
+ "title": "`pow()`, `sqrt()`, `hypot()`, `log()`, `exp()` exponential functions",
+ "description": "Compute various exponential functions with their arguments",
+ "specification": "https://www.w3.org/TR/css-values-4/#exponent-funcs",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "118",
+ "firefox": "118",
+ "ios_saf": "15.4",
+ "safari": "15.4"
+ },
+ "example": "p {\n font-size: calc(pow(10, 12) * 1rem);\n font-size: calc(sqrt(100) * 1rem);\n font-size: calc(hypot(3, 4) * 1rem);\n font-size: calc(log(10) * 1rem);\n font-size: calc(exp(10) * 1rem);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-exponential-functions"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "fangsong-font-family",
+ "title": "`fangsong` Font Family",
+ "description": "A generic font used for Fang Song (仿宋) typefaces in Chinese",
+ "specification": "https://www.w3.org/TR/css-fonts-4/#fangsong-def",
+ "stage": 2,
+ "browser_support": {},
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/font-family#Syntax"
+ },
+ "example": "body {\n font-family: fangsong;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/JLHwung/postcss-font-family-fangsong"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "float-clear-logical-values",
+ "title": "Logical Values in float and clear",
+ "description": "Flow-relative (inline-start and inline-end) values for float and clear",
+ "specification": "https://www.w3.org/TR/css-logical-1/",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "118",
+ "and_ff": "55",
+ "android": "118",
+ "chrome": "118",
+ "edge": "118",
+ "firefox": "55",
+ "ios_saf": "15",
+ "opera": "104",
+ "safari": "15"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/float#browser_compatibility"
+ },
+ "example": "span:first-child {\n float: inline-start;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical-float-and-clear"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "focus-visible-pseudo-class",
+ "title": "`:focus-visible` Focus-Indicated Pseudo-Class",
+ "description": "A pseudo-class for matching focused elements that indicate that focus to a user",
+ "specification": "https://www.w3.org/TR/selectors-4/#focus-visible-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "86",
+ "and_ff": "85",
+ "android": "86",
+ "chrome": "86",
+ "edge": "86",
+ "firefox": "85",
+ "ios_saf": "15.4",
+ "oculus": "12.0",
+ "op_mob": "61",
+ "opera": "72",
+ "safari": "15.4",
+ "samsung": "14.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible"
+ },
+ "example": ":focus:not(:focus-visible) {\n outline: 0;\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://github.com/WICG/focus-visible"
+ },
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-focus-visible"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "focus-within-pseudo-class",
+ "title": "`:focus-within` Focus Container Pseudo-Class",
+ "description": "A pseudo-class for matching elements that are either focused or that have focused descendants",
+ "specification": "https://www.w3.org/TR/selectors-4/#focus-within-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "60",
+ "and_ff": "52",
+ "android": "60",
+ "chrome": "60",
+ "edge": "79",
+ "firefox": "52",
+ "ios_saf": "10.3",
+ "oculus": "5.0",
+ "op_mob": "44",
+ "opera": "47",
+ "safari": "10.1",
+ "samsung": "8.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-within"
+ },
+ "example": "form:focus-within {\n background: rgba(0, 0, 0, 0.3);\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://github.com/jsxtools/focus-within"
+ },
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-focus-within"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "font-format-keywords",
+ "title": "Font `format()` Keywords",
+ "description": "A syntax for specifying font format as a keyword in `@font-face` rule’s `format()` function",
+ "specification": "https://www.w3.org/TR/css-fonts-4/#font-format-values",
+ "stage": 2,
+ "browser_support": {
+ "ios_saf": "5",
+ "safari": "4"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face"
+ },
+ "example": "@font-face {\n src: url(file.woff2) format(woff2);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/valtlai/postcss-font-format-keywords"
+ }
+ ],
+ "vendors_implementations": 1
+ },
+ {
+ "id": "font-variant-property",
+ "title": "`font-variant` Property",
+ "description": "A property for defining the usage of alternate glyphs in a font",
+ "specification": "https://www.w3.org/TR/css-fonts-3/#propdef-font-variant",
+ "stage": 4,
+ "browser_support": {
+ "and_ff": "34",
+ "firefox": "34",
+ "ios_saf": "9.3",
+ "safari": "9.1"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/font-variant"
+ },
+ "example": "h2 {\n font-variant: small-caps;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/postcss/postcss-font-variant"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "gamut-mapping",
+ "title": "Gamut mapping for CSS color functions",
+ "description": "Gamut map css colors to fit display specific gamuts.",
+ "specification": "https://www.w3.org/TR/css-color-4/#gamut-mapping",
+ "stage": 2,
+ "browser_support": {},
+ "example": "@media (color-gamut: rec2020) {\n\tp {\n\t\tcolor: oklch(40% 0.234 0.39 / 0.5);\n\t}\n}",
+ "polyfills": [],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "gap-properties",
+ "title": "Gap Properties",
+ "description": "Properties for defining gutters within a layout",
+ "specification": "https://www.w3.org/TR/css-grid-1/#gutters",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "66",
+ "and_ff": "61",
+ "android": "66",
+ "chrome": "66",
+ "edge": "16",
+ "firefox": "61",
+ "ios_saf": "12",
+ "oculus": "5.0",
+ "op_mob": "47",
+ "opera": "53",
+ "safari": "12",
+ "samsung": "9.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/gap"
+ },
+ "example": ".grid-1 {\n gap: 20px;\n}\n\n.grid-2 {\n column-gap: 40px;\n row-gap: 20px;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-gap-properties"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "gradients-interpolation-method",
+ "title": "Gradients Interpolation Method",
+ "description": "Define the interpolation method for gradients",
+ "specification": "https://www.w3.org/TR/css-images-4/#color-interpolation",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "ios_saf": "16.2",
+ "opera": "97",
+ "safari": "16.2",
+ "samsung": "22.0"
+ },
+ "example": ".pie_chart {\n background-image: conic-gradient(in oklch, yellowgreen 40%, gold 0deg 75%, #f06 0deg);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-gradients-interpolation-method"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "gray-function",
+ "title": "`gray()` Function",
+ "description": "A function for specifying fully desaturated colors",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-gray",
+ "stage": -1,
+ "browser_support": {},
+ "example": "p {\n color: gray(50);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/postcss/postcss-color-gray"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "grid-layout",
+ "title": "Grid Layout",
+ "description": "A syntax for using a grid concept to lay out content",
+ "specification": "https://www.w3.org/TR/css-grid-1/",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "57",
+ "and_ff": "52",
+ "android": "57",
+ "chrome": "57",
+ "edge": "16",
+ "firefox": "52",
+ "ios_saf": "10.3",
+ "oculus": "5.0",
+ "op_mob": "43",
+ "opera": "44",
+ "safari": "10.1",
+ "samsung": "6.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/grid"
+ },
+ "example": "section {\n display: grid;\n grid-template-columns: 100px 100px 100px;\n grid-gap: 10px;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/postcss/autoprefixer"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "has-pseudo-class",
+ "title": "`:has()` Relational Pseudo-Class",
+ "description": "A pseudo-class for matching ancestor and sibling elements",
+ "specification": "https://www.w3.org/TR/selectors-4/#has-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "105",
+ "android": "105",
+ "chrome": "105",
+ "edge": "105",
+ "ios_saf": "15.4",
+ "op_mob": "72",
+ "opera": "91",
+ "safari": "15.4",
+ "samsung": "20.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:has"
+ },
+ "example": "a:has(> img) {\n display: block;\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-has-pseudo"
+ },
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-has-pseudo"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "hexadecimal-alpha-notation",
+ "title": "Hexadecimal Alpha Notation",
+ "description": "A 4 & 8 character hex color notation for specifying the opacity level",
+ "specification": "https://www.w3.org/TR/css-color-4/#hex-notation",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "62",
+ "and_ff": "49",
+ "android": "62",
+ "chrome": "62",
+ "edge": "79",
+ "firefox": "49",
+ "ios_saf": "9.3",
+ "oculus": "5.0",
+ "op_mob": "47",
+ "opera": "49",
+ "safari": "10",
+ "samsung": "8.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#Syntax_2"
+ },
+ "example": "section {\n background-color: #f3f3f3f3;\n color: #0003;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-hex-alpha"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "hwb-function",
+ "title": "`hwb()` Function",
+ "description": "A function for specifying colors by hue and then a degree of whiteness and blackness to mix into it",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-hwb",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "101",
+ "and_ff": "96",
+ "android": "101",
+ "chrome": "101",
+ "edge": "101",
+ "firefox": "96",
+ "ios_saf": "15",
+ "oculus": "22.0",
+ "op_mob": "70",
+ "opera": "87",
+ "safari": "15",
+ "samsung": "19.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hwb()"
+ },
+ "example": "p {\n color: hwb(120 44% 50%);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-hwb-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "ic-unit",
+ "title": "`ic` length unit",
+ "description": "Equal to the used advance measure of the \"水\" (CJK water ideograph, U+6C34) glyph found in the font used to render it",
+ "specification": "https://www.w3.org/TR/css-values-4/#ic",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "106",
+ "and_ff": "97",
+ "android": "106",
+ "chrome": "106",
+ "edge": "106",
+ "firefox": "97",
+ "ios_saf": "15.4",
+ "op_mob": "72",
+ "opera": "92",
+ "safari": "15.4",
+ "samsung": "20.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Values_and_Units#dimensions"
+ },
+ "example": "p {\n text-indent: 2ic;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-ic-unit"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "image-set-function",
+ "title": "`image-set()` Function",
+ "description": "A function for specifying image sources based on the user’s resolution",
+ "specification": "https://www.w3.org/TR/css-images-4/#image-set-notation",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "25",
+ "and_ff": "88",
+ "android": "4.4",
+ "chrome": "21",
+ "edge": "79",
+ "firefox": "88",
+ "ios_saf": "14",
+ "oculus": "5.0",
+ "op_mob": "14",
+ "opera": "15",
+ "safari": "14",
+ "samsung": "1.5"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/image-set"
+ },
+ "example": "p {\n background-image: image-set(\n \"foo.png\" 1x,\n \"foo-2x.png\" 2x,\n \"foo-print.png\" 600dpi\n );\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-image-set-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "in-out-of-range-pseudo-class",
+ "title": "`:in-range` and `:out-of-range` Pseudo-Classes",
+ "description": "A pseudo-class for matching elements that have range limitations",
+ "specification": "https://www.w3.org/TR/selectors-4/#range-pseudos",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "18",
+ "and_ff": "16",
+ "android": "2.2",
+ "chrome": "10",
+ "edge": "13",
+ "firefox": "29",
+ "ios_saf": "5",
+ "oculus": "5.0",
+ "op_mob": "11",
+ "opera": "11",
+ "safari": "5.1",
+ "samsung": "1.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:in-range"
+ },
+ "example": "input:in-range {\n background-color: rgba(0, 255, 0, 0.25);\n}\ninput:out-of-range {\n background-color: rgba(255, 0, 0, 0.25);\n border: 2px solid red;\n}",
+ "vendors_implementations": 3
+ },
+ {
+ "id": "is-pseudo-class",
+ "title": "`:is()` Matches-Any Pseudo-Class",
+ "description": "A pseudo-class for matching elements in a selector list",
+ "specification": "https://www.w3.org/TR/selectors-4/#matches-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "88",
+ "and_ff": "82",
+ "android": "88",
+ "chrome": "88",
+ "edge": "88",
+ "firefox": "82",
+ "ios_saf": "14",
+ "oculus": "14.0",
+ "op_mob": "63",
+ "opera": "74",
+ "safari": "14",
+ "samsung": "15.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:is"
+ },
+ "example": "p:is(:first-child, .special) {\n margin-top: 1em;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-is-pseudo-class"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "lab-function",
+ "title": "`lab()` Function",
+ "description": "A function for specifying colors expressed in the CIE Lab color space",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-lab",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "113",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "113",
+ "ios_saf": "15",
+ "opera": "97",
+ "safari": "15",
+ "samsung": "22.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lab()"
+ },
+ "example": "body {\n color: lab(80% 50 20);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-lab-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "lch-function",
+ "title": "`lch()` Function",
+ "description": "A function for specifying colors expressed in the CIE Lab color space with chroma and hue",
+ "specification": "https://www.w3.org/TR/css-color-4/#funcdef-lch",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "113",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "113",
+ "ios_saf": "15",
+ "opera": "97",
+ "safari": "15",
+ "samsung": "22.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lch()"
+ },
+ "example": "body {\n color: lch(53% 105 40);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-lab-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "logical-properties-and-values",
+ "title": "Logical Properties and Values",
+ "description": "Flow-relative (left-to-right or right-to-left) properties and values",
+ "specification": "https://www.w3.org/TR/css-logical-1/",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "89",
+ "and_ff": "66",
+ "android": "89",
+ "chrome": "89",
+ "edge": "89",
+ "firefox": "66",
+ "ios_saf": "15",
+ "oculus": "15.0",
+ "op_mob": "63",
+ "opera": "75",
+ "safari": "15",
+ "samsung": "15.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Logical_Properties"
+ },
+ "example": "span:first-child {\n margin-inline-start: 10px;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "logical-resize",
+ "title": "Logical values in the `resize` property",
+ "description": "Flow-relative (block or inline) values in resize",
+ "specification": "https://www.w3.org/TR/css-logical-1/",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "118",
+ "and_ff": "63",
+ "android": "118",
+ "chrome": "118",
+ "edge": "118",
+ "firefox": "63",
+ "ios_saf": "16",
+ "opera": "104",
+ "safari": "16"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/resize"
+ },
+ "example": "area {\n resize: inline;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical-resize"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "logical-viewport-units",
+ "title": "Logical Viewport Units",
+ "description": "Flow-relative (horizontal or vertical) Viewport Units",
+ "specification": "https://www.w3.org/TR/css-values-4/#viewport-relative-units",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "108",
+ "and_ff": "101",
+ "android": "108",
+ "chrome": "108",
+ "edge": "108",
+ "firefox": "101",
+ "ios_saf": "15.4",
+ "op_mob": "73",
+ "opera": "94",
+ "safari": "15.4",
+ "samsung": "21.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/length#vb"
+ },
+ "example": "span:first-child {\n width: 5vi; height: 10vb; \n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical-viewport-units"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "matches-pseudo-class",
+ "title": "`:matches()` Matches-Any Pseudo-Class",
+ "description": "A pseudo-class for matching elements in a selector list",
+ "specification": "https://www.w3.org/TR/selectors-4/#selectordef-matches",
+ "stage": -1,
+ "browser_support": {
+ "and_chr": "88",
+ "and_ff": "82",
+ "android": "88",
+ "chrome": "88",
+ "edge": "88",
+ "firefox": "82",
+ "ios_saf": "14",
+ "oculus": "14.0",
+ "op_mob": "63",
+ "opera": "74",
+ "safari": "14",
+ "samsung": "15.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:is"
+ },
+ "example": "p:matches(:first-child, .special) {\n margin-top: 1em;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/postcss/postcss-selector-matches"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "media-queries-aspect-ratio-number-values",
+ "title": "Aspect-Ratio number values",
+ "description": "Support `<ratio>` values with `<number>` components in `@media`",
+ "specification": "https://www.w3.org/TR/css-values-4/#ratio-value",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "110",
+ "and_ff": "78",
+ "android": "110",
+ "chrome": "110",
+ "edge": "110",
+ "firefox": "78",
+ "ios_saf": "16.4",
+ "safari": "16.4"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/ratio"
+ },
+ "example": "@media (aspect-ratio: 1.77) {\n html {\n background-color: cyan;\n }\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-media-queries-aspect-ratio-number-values"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "media-query-ranges",
+ "title": "Media Query Ranges",
+ "description": "A syntax for defining media query ranges using ordinary comparison operators",
+ "specification": "https://www.w3.org/TR/mediaqueries-4/#range-context",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "104",
+ "and_ff": "102",
+ "android": "104",
+ "chrome": "104",
+ "edge": "104",
+ "firefox": "102",
+ "ios_saf": "16.4",
+ "oculus": "23.0",
+ "op_mob": "71",
+ "opera": "90",
+ "safari": "16.4",
+ "samsung": "20.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries#Syntax_improvements_in_Level_4"
+ },
+ "example": "@media (width < 480px) {}\n\n@media (480px <= width < 768px) {}\n\n@media (width >= 768px) {}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-media-minmax"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "nested-calc",
+ "title": "Nested `calc()`",
+ "description": "Nest calc functions with the calc function name",
+ "specification": "https://www.w3.org/TR/css-values-4/#calc-func",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "51",
+ "and_ff": "48",
+ "android": "51",
+ "chrome": "51",
+ "edge": "16",
+ "firefox": "48",
+ "ios_saf": "11",
+ "oculus": "5.0",
+ "op_mob": "41",
+ "opera": "38",
+ "safari": "11",
+ "samsung": "5.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/calc"
+ },
+ "example": "p {\n padding: calc(1px + calc(4 / 3));\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nested-calc"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "nesting-rules",
+ "title": "Nesting Rules",
+ "description": "A syntax for nesting relative rules within rules",
+ "specification": "https://www.w3.org/TR/css-nesting-1/",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "117",
+ "firefox": "117"
+ },
+ "example": "article {\n & p {\n color: #333;\n }\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-nesting"
+ }
+ ],
+ "vendors_implementations": 1
+ },
+ {
+ "id": "not-pseudo-class",
+ "title": "`:not()` Negation List Pseudo-Class",
+ "description": "A pseudo-class for ignoring elements in a selector list",
+ "specification": "https://www.w3.org/TR/selectors-4/#negation-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "88",
+ "and_ff": "84",
+ "android": "88",
+ "chrome": "88",
+ "edge": "88",
+ "firefox": "84",
+ "ios_saf": "9",
+ "oculus": "14.0",
+ "opera": "74",
+ "safari": "9",
+ "samsung": "15.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:not"
+ },
+ "example": "p:not(:first-child, .special) {\n margin-top: 1em;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-selector-not"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "oklab-function",
+ "title": "`oklab` and `oklch` color functions",
+ "description": "Functions that allow colors to be expressed in OKLab and OKLCH.",
+ "specification": "https://www.w3.org/TR/css-color-4/#specifying-oklab-oklch",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "113",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "113",
+ "ios_saf": "15.4",
+ "opera": "97",
+ "safari": "15.4",
+ "samsung": "22.0"
+ },
+ "example": "p {\n color: oklab(72.322% -0.0465 -0.1150);\n color: oklch(72.322% 0.12403 247.996);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-oklab-function"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "opacity-percentage",
+ "title": "Support for percentages for `opacity`",
+ "description": "Syntactic sugar to use percentages instead of a float between 0 and 1.",
+ "specification": "https://www.w3.org/TR/css-color-4/#transparency",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "78",
+ "and_ff": "79",
+ "android": "78",
+ "chrome": "78",
+ "edge": "79",
+ "firefox": "70",
+ "ios_saf": "13.4",
+ "oculus": "8.0",
+ "op_mob": "56",
+ "opera": "65",
+ "safari": "13.1",
+ "samsung": "12.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/opacity"
+ },
+ "example": "img {\n opacity: 90%;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/mrcgrtz/postcss-opacity-percentage"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "overflow-property",
+ "title": "`overflow` Shorthand Property",
+ "description": "A property for defining `overflow-x` and `overflow-y`",
+ "specification": "https://www.w3.org/TR/css-overflow-3/#propdef-overflow",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "68",
+ "and_ff": "61",
+ "android": "68",
+ "chrome": "68",
+ "edge": "79",
+ "firefox": "61",
+ "ios_saf": "13.4",
+ "oculus": "6.0",
+ "op_mob": "48",
+ "opera": "55",
+ "safari": "13.1",
+ "samsung": "10.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/overflow"
+ },
+ "example": "html {\n overflow: hidden auto;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-overflow-shorthand"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "overflow-wrap-property",
+ "title": "`overflow-wrap` Property",
+ "description": "A property for defining whether to insert line breaks within words to prevent overflowing",
+ "specification": "https://www.w3.org/TR/css-text-3/#overflow-wrap-property",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "25",
+ "and_ff": "49",
+ "android": "37",
+ "chrome": "23",
+ "edge": "18",
+ "firefox": "49",
+ "ios_saf": "7",
+ "oculus": "5.0",
+ "op_mob": "12.1",
+ "opera": "12.1",
+ "safari": "7",
+ "samsung": "1.5"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-wrap"
+ },
+ "example": "p {\n overflow-wrap: break-word;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/mattdimu/postcss-replace-overflow-wrap"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "overscroll-behavior-property",
+ "title": "`overscroll-behavior` Property",
+ "description": "Properties for controlling when the scroll position of a scroll container reaches the edge of a scrollport",
+ "specification": "https://www.w3.org/TR/css-overscroll-1/",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "63",
+ "and_ff": "59",
+ "android": "63",
+ "chrome": "63",
+ "firefox": "59",
+ "ios_saf": "16",
+ "oculus": "5.0",
+ "op_mob": "46",
+ "opera": "50",
+ "safari": "16",
+ "samsung": "8.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/overscroll-behavior"
+ },
+ "example": ".messages {\n height: 220px;\n overflow: auto;\n overscroll-behavior-y: contain;\n}\n\nbody {\n margin: 0;\n overscroll-behavior: none;\n}",
+ "vendors_implementations": 3
+ },
+ {
+ "id": "place-properties",
+ "title": "Place Properties",
+ "description": "Properties for defining alignment within a layout",
+ "specification": "https://www.w3.org/TR/css-align-3/#place-items-property",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "59",
+ "and_ff": "53",
+ "android": "59",
+ "chrome": "59",
+ "edge": "79",
+ "firefox": "53",
+ "ios_saf": "11",
+ "oculus": "5.0",
+ "op_mob": "43",
+ "opera": "46",
+ "safari": "11",
+ "samsung": "7.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/place-content"
+ },
+ "example": ".example {\n place-content: flex-end;\n place-items: center / space-between;\n place-self: flex-start / center;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-place"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "prefers-color-scheme-query",
+ "title": "`prefers-color-scheme` Media Query",
+ "description": "A media query to detect if the user has requested the system use a light or dark color theme",
+ "specification": "https://www.w3.org/TR/mediaqueries-5/#prefers-color-scheme",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "76",
+ "and_ff": "67",
+ "android": "76",
+ "chrome": "76",
+ "edge": "79",
+ "firefox": "67",
+ "ios_saf": "13",
+ "oculus": "7.0",
+ "op_mob": "54",
+ "opera": "62",
+ "safari": "12.1",
+ "samsung": "14.2"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme"
+ },
+ "example": "body {\n background-color: white;\n color: black;\n}\n\n@media (prefers-color-scheme: dark) {\n body {\n background-color: black;\n color: white;\n }\n}",
+ "polyfills": [
+ {
+ "type": "JavaScript Library",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-prefers-color-scheme"
+ },
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/css-prefers-color-scheme"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "prefers-reduced-motion-query",
+ "title": "`prefers-reduced-motion` Media Query",
+ "description": "A media query to detect if the user has requested less animation and general motion on the page",
+ "specification": "https://www.w3.org/TR/mediaqueries-5/#prefers-reduced-motion",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "74",
+ "and_ff": "64",
+ "android": "74",
+ "chrome": "74",
+ "edge": "79",
+ "firefox": "63",
+ "ios_saf": "10.3",
+ "oculus": "6.0",
+ "op_mob": "53",
+ "opera": "62",
+ "safari": "10.1",
+ "samsung": "11.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion"
+ },
+ "example": ".animation {\n animation: vibrate 0.3s linear infinite both; \n}\n\n@media (prefers-reduced-motion: reduce) {\n .animation {\n animation: none;\n }\n}",
+ "vendors_implementations": 3
+ },
+ {
+ "id": "read-only-write-pseudo-class",
+ "title": "`:read-only` and `:read-write` selectors",
+ "description": "Pseudo-classes to match elements which are considered user-alterable",
+ "specification": "https://www.w3.org/TR/selectors-4/#rw-pseudos",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "18",
+ "android": "37",
+ "chrome": "1",
+ "edge": "13",
+ "firefox": "78",
+ "ios_saf": "3.2",
+ "oculus": "5.0",
+ "op_mob": "10.1",
+ "opera": "9",
+ "safari": "4",
+ "samsung": "1.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:read-only"
+ },
+ "example": "input:read-only {\n background-color: #ccc;\n}",
+ "vendors_implementations": 3
+ },
+ {
+ "id": "rebeccapurple-color",
+ "title": "`rebeccapurple` Color",
+ "description": "A particularly lovely shade of purple in memory of Rebecca Alison Meyer",
+ "specification": "https://www.w3.org/TR/css-color-4/#valdef-color-rebeccapurple",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "38",
+ "and_ff": "33",
+ "android": "38",
+ "chrome": "38",
+ "edge": "12",
+ "firefox": "33",
+ "ie": "11",
+ "ios_saf": "8",
+ "oculus": "5.0",
+ "op_mob": "25",
+ "opera": "25",
+ "safari": "9",
+ "samsung": "3.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/color_value"
+ },
+ "example": "html {\n color: rebeccapurple;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-rebeccapurple"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "relative-color-syntax",
+ "title": "Relative Color Syntax",
+ "description": "Modify existing colors using color functions",
+ "specification": "https://www.w3.org/TR/css-color-5/#relative-colors",
+ "stage": 2,
+ "browser_support": {
+ "ios_saf": "16.4",
+ "safari": "16.4"
+ },
+ "docs": {},
+ "example": "p {\n color: lch(from peru calc(l * 0.8) c h);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-relative-color-syntax"
+ }
+ ],
+ "vendors_implementations": 1
+ },
+ {
+ "id": "scope-pseudo-class",
+ "title": "`:scope()` Reference Element Pseudo-class",
+ "description": "A pseudo-class for matching one or more scoping roots",
+ "specification": "https://www.w3.org/TR/selectors-4/#the-scope-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "27",
+ "and_ff": "32",
+ "android": "4.4",
+ "chrome": "27",
+ "edge": "79",
+ "firefox": "32",
+ "ios_saf": "7",
+ "oculus": "5.0",
+ "op_mob": "15",
+ "opera": "15",
+ "safari": "7",
+ "samsung": "1.5"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:scope"
+ },
+ "example": ":scope {\n background-color: pink;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-scope-pseudo-class"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "sign-functions",
+ "title": "`abs()` and `sign()` functions",
+ "description": "The sign-related functions—abs() and sign()—compute various functions related to the sign of their argument",
+ "specification": "https://www.w3.org/TR/css-values-4/#sign-funcs",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "118",
+ "firefox": "118",
+ "ios_saf": "15.4",
+ "safari": "15.4"
+ },
+ "example": "div {\n order: abs(-10);\n order: sign(-10);\n}",
+ "vendors_implementations": 2
+ },
+ {
+ "id": "src-function",
+ "title": "`src()` function",
+ "description": "The argument of `src()` can be provided by functions, such as var(). Otherwise this behaves the same as `url()`",
+ "specification": "https://www.w3.org/TR/css-values-4/#funcdef-src",
+ "stage": 2,
+ "browser_support": {},
+ "example": "div {\n background: src('./image.jpg');\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/google/postcss-src"
+ }
+ ],
+ "vendors_implementations": 0
+ },
+ {
+ "id": "stepped-value-functions",
+ "title": "`round()`, `mod()` and `rem()` functions",
+ "description": "The stepped-value functions, `round()`, `mod()`, and `rem()`, all transform a given value according to another \"step value\", in different ways",
+ "specification": "https://www.w3.org/TR/css-values-4/#round-func",
+ "stage": 2,
+ "browser_support": {
+ "and_ff": "118",
+ "firefox": "118",
+ "ios_saf": "15.4",
+ "safari": "15.4"
+ },
+ "example": "div {\n left: mod(18px, 5px);\n top: rem(18px, 5px);\n right: round(2.5px, 1px);\n bottom: round(up, 15px, 7px);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-stepped-value-functions"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "system-ui-font-family",
+ "title": "`system-ui` Font Family",
+ "description": "A generic font used to match the user’s interface",
+ "specification": "https://www.w3.org/TR/css-fonts-4/#system-ui-def",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "56",
+ "and_ff": "92",
+ "android": "56",
+ "chrome": "56",
+ "edge": "79",
+ "firefox": "92",
+ "ios_saf": "11",
+ "oculus": "5.0",
+ "op_mob": "43",
+ "opera": "43",
+ "safari": "11",
+ "samsung": "6.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/font-family#Syntax"
+ },
+ "example": "body {\n font-family: system-ui;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/JLHwung/postcss-font-family-system-ui"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "text-decoration-shorthand",
+ "title": "`text-decoration` shorthand",
+ "description": "A property for defining `text-decoration-line`, `text-decoration-thickness`, `text-decoration-style` and `text-decoration-color`",
+ "specification": "https://www.w3.org/TR/css-text-decor-4/#text-decoration-property",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "87",
+ "and_ff": "79",
+ "android": "87",
+ "chrome": "87",
+ "edge": "87",
+ "firefox": "70",
+ "oculus": "13.0",
+ "op_mob": "62",
+ "opera": "73",
+ "samsung": "14.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/text-decoration"
+ },
+ "example": "p {\n text-decoration: green wavy underline 2px;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-text-decoration-shorthand"
+ }
+ ],
+ "vendors_implementations": 2
+ },
+ {
+ "id": "trigonometric-functions",
+ "title": "`sin()`, `cos()`, `tan()`, `asin()`, `acos()`, `atan()` and `atan2()` functions",
+ "description": "Functions to calculate various basic trigonometric relationships",
+ "specification": "https://www.w3.org/TR/css-values-4/#trig-funcs",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "111",
+ "and_ff": "108",
+ "android": "111",
+ "chrome": "111",
+ "edge": "111",
+ "firefox": "108",
+ "ios_saf": "15.4",
+ "opera": "97",
+ "safari": "15.4",
+ "samsung": "22.0"
+ },
+ "example": "body {\n left: sin(45deg);\n left: cos(45deg);\n left: tan(45deg);\n left: asin(0.5);\n left: acos(0.5);\n left: atan(10);\n left: atan2(-1, 1);\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-trigonometric-functions"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "unset-value",
+ "title": "`unset` Keyword",
+ "description": "The unset CSS keyword resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.",
+ "specification": "https://www.w3.org/TR/css-cascade-4/#inherit-initial",
+ "stage": 3,
+ "browser_support": {
+ "and_chr": "41",
+ "and_ff": "27",
+ "android": "41",
+ "chrome": "41",
+ "edge": "13",
+ "firefox": "27",
+ "ios_saf": "9.3",
+ "oculus": "5.0",
+ "op_mob": "28",
+ "opera": "28",
+ "safari": "9.1",
+ "samsung": "4.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/unset"
+ },
+ "example": "div {\n border-color: unset;\n color: unset;\n}",
+ "polyfills": [
+ {
+ "type": "PostCSS Plugin",
+ "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-unset-value"
+ }
+ ],
+ "vendors_implementations": 3
+ },
+ {
+ "id": "when-else-rules",
+ "title": "When/Else Rules",
+ "description": "At-rules for specifying media queries and support queries in a single grammar",
+ "specification": "https://www.w3.org/TR/2021/WD-css-conditional-5-20211221/",
+ "stage": 2,
+ "browser_support": {},
+ "example": "@when media(width >= 640px) and (supports(display: flex) or supports(display: grid)) {\n /* A */\n} @else media(pointer: coarse) {\n /* B */\n} @else {\n /* C */\n}",
+ "vendors_implementations": 0
+ },
+ {
+ "id": "where-pseudo-class",
+ "title": "`:where()` Zero-Specificity Pseudo-Class",
+ "description": "A pseudo-class for matching elements in a selector list without contributing specificity",
+ "specification": "https://www.w3.org/TR/selectors-4/#where-pseudo",
+ "stage": 2,
+ "browser_support": {
+ "and_chr": "88",
+ "and_ff": "82",
+ "android": "88",
+ "chrome": "88",
+ "edge": "88",
+ "firefox": "82",
+ "ios_saf": "14",
+ "oculus": "14.0",
+ "op_mob": "63",
+ "opera": "74",
+ "safari": "14",
+ "samsung": "15.0"
+ },
+ "docs": {
+ "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/:where"
+ },
+ "example": "a:where(:not(:hover)) {\n text-decoration: none;\n}",
+ "vendors_implementations": 3
+ }
+]
generated by cgit v1.2.3 (git 2.25.1) at 2026-11-01 15:18:13 +0000