export default [
{
"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": {
"edge": "79",
"firefox": "27",
"chrome": "37",
"safari": "9.1",
"opera": "24",
"ios_saf": "9.3",
"android": "4.4.3",
"op_mob": "64",
"and_chr": "37",
"and_ff": "27",
"and_uc": "12.12",
"samsung": "4",
"and_qq": "10.4",
"baidu": "7.12",
"kaios": "2.5"
},
"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": {
"chrome": "1",
"and_chr": "18",
"edge": "79",
"firefox": "1",
"and_ff": "4",
"opera": "15",
"op_mob": "14",
"safari": "3",
"ios_saf": "1",
"samsung": "1.0",
"android": "65"
},
"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": {
"ie": "10",
"edge": "12",
"safari": "10",
"opera": "11.1",
"ios_saf": "10",
"op_mini": "all",
"op_mob": "11.1",
"ie_mob": "10",
"and_uc": "12.12",
"samsung": "5"
},
"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": 1
},
{
"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": {
"edge": "79",
"firefox": "47",
"chrome": "49",
"safari": "9",
"opera": "36",
"ios_saf": "9",
"android": "49",
"op_mob": "64",
"and_chr": "49",
"and_ff": "47",
"and_uc": "12.12",
"samsung": "5",
"and_qq": "10.4",
"kaios": "2.5"
},
"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/Semigradsky/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": {
"chrome": "79",
"and_chr": "79",
"edge": "79",
"firefox": "75",
"and_ff": "79",
"opera": "66",
"op_mob": "57",
"safari": "13.1",
"ios_saf": "13.4",
"samsung": "12.0",
"android": "79"
},
"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": {
"firefox": "48",
"and_ff": "48",
"kaios": "2.5"
},
"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": 1
},
{
"id": "color-contrast",
"title": "`color-contrast()` Function",
"description": "A function for choosing the color that contrasts the most.",
"specification": "https://www.w3.org/TR/css-color-5/#colorcontrast",
"stage": 2,
"browser_support": {
"safari": "15",
"ios_saf": "15"
},
"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": 1
},
{
"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": {
"safari": "15",
"ios_saf": "15"
},
"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": 1
},
{
"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": {
"chrome": "65",
"and_chr": "65",
"edge": "79",
"firefox": "52",
"and_ff": "52",
"opera": "52",
"op_mob": "47",
"safari": "12.1",
"ios_saf": "12.2",
"samsung": "9.0",
"android": "65"
},
"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://drafts.csswg.org/css-color-5/#color-mix",
"stage": -1,
"browser_support": {},
"example": "p {\n color: color-mix(in lch, purple 50%, plum 50%);\n}",
"polyfills": [],
"vendors_implementations": 0
},
{
"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": 0,
"browser_support": {},
"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": 0
},
{
"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/postcss/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": {
"edge": "16",
"firefox": "31",
"chrome": "49",
"safari": "10",
"opera": "36",
"ios_saf": "10",
"android": "49",
"op_mob": "64",
"and_chr": "49",
"and_ff": "31",
"and_uc": "12.12",
"samsung": "5",
"kaios": "2.5"
},
"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/postcss/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": {
"firefox": "49",
"and_ff": "49"
},
"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": 1
},
{
"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": {
"firefox": "70",
"safari": "15",
"ios_saf": "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": 2
},
{
"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": {
"chrome": "72",
"and_chr": "72",
"edge": "79",
"firefox": "83",
"and_ff": "83",
"opera": "60",
"op_mob": "51",
"safari": "12.1",
"ios_saf": "12.2",
"samsung": "11.0",
"android": "72"
},
"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": {
"edge": "79",
"firefox": "65",
"chrome": "69",
"safari": "11.1",
"opera": "56",
"ios_saf": "11.3",
"android": "69",
"op_mob": "64",
"and_chr": "69",
"and_ff": "65",
"samsung": "10.1"
},
"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": 3
},
{
"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": "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": {
"chrome": "67",
"and_chr": "67",
"edge": "79",
"firefox": "85",
"and_ff": "85",
"opera": "54",
"op_mob": "48",
"samsung": "14.0",
"android": "86"
},
"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": 2
},
{
"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": {
"edge": "79",
"firefox": "52",
"chrome": "60",
"safari": "10.1",
"opera": "47",
"ios_saf": "10.3",
"android": "60",
"op_mob": "64",
"and_chr": "60",
"and_ff": "52",
"samsung": "8.2",
"and_qq": "10.4"
},
"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": 1,
"browser_support": {
"safari": "4",
"ios_saf": "5"
},
"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": {
"firefox": "34",
"safari": "9.1",
"ios_saf": "9.3",
"and_ff": "34",
"kaios": "2.5"
},
"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": "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": {
"chrome": "66",
"and_chr": "66",
"edge": "16",
"firefox": "61",
"and_ff": "61",
"opera": "53",
"op_mob": "47",
"safari": "12",
"ios_saf": "12",
"samsung": "9.0",
"android": "66"
},
"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": "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": {
"edge": "16",
"firefox": "54",
"chrome": "58",
"safari": "10.1",
"opera": "44",
"ios_saf": "10.3",
"android": "58",
"op_mob": "64",
"and_chr": "58",
"and_ff": "54",
"and_uc": "12.12",
"samsung": "6.2",
"and_qq": "10.4",
"kaios": "2.5"
},
"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": {
"safari": "15.4",
"ios_saf": "15.4"
},
"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"
},
{
"type": "Experimental Library",
"link": "https://github.com/csstools/postcss-plugins/tree/main/experimental/css-has-pseudo"
}
],
"vendors_implementations": 0
},
{
"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": {
"edge": "79",
"firefox": "49",
"chrome": "62",
"safari": "10",
"opera": "52",
"ios_saf": "10",
"android": "62",
"op_mob": "64",
"and_chr": "62",
"and_ff": "49",
"samsung": "8.2"
},
"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": {
"firefox": "96",
"and_ff": "96",
"safari": "15",
"ios_saf": "15"
},
"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": 2
},
{
"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": {
"firefox": "97",
"and_ff": "97",
"safari": "15.4",
"ios_saf": "15.4"
},
"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": 1
},
{
"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": {},
"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": 0
},
{
"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": {
"edge": "79",
"firefox": "50",
"chrome": "53",
"safari": "10.1",
"opera": "40",
"ios_saf": "10.3",
"android": "53",
"op_mob": "64",
"and_chr": "53",
"and_ff": "50",
"and_uc": "12.12",
"samsung": "5",
"and_qq": "10.4",
"baidu": "7.12"
},
"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": {
"edge": "88",
"firefox": "78",
"chrome": "88",
"safari": "14",
"opera": "75",
"ios_saf": "14",
"android": "88",
"op_mob": "64",
"and_chr": "88",
"and_ff": "78",
"samsung": "15"
},
"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": {
"safari": "15",
"ios_saf": "15"
},
"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": 1
},
{
"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": {
"safari": "15",
"ios_saf": "15"
},
"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": 1
},
{
"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": {
"edge": "89",
"firefox": "66",
"chrome": "89",
"safari": "15",
"opera": "76",
"ios_saf": "15",
"android": "89",
"op_mob": "64",
"and_chr": "89",
"and_ff": "66",
"samsung": "15"
},
"docs": {
"mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Logical_Properties"
},
"example": "span:first-child {\n float: inline-start;\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": "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": {
"edge": "88",
"firefox": "78",
"chrome": "88",
"safari": "14",
"opera": "75",
"ios_saf": "14",
"android": "88",
"op_mob": "64",
"and_chr": "88",
"and_ff": "78",
"samsung": "15"
},
"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-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": {},
"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/postcss/postcss-media-minmax"
}
],
"vendors_implementations": 0
},
{
"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": 1,
"browser_support": {},
"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": 0
},
{
"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": {
"edge": "88",
"firefox": "84",
"chrome": "88",
"safari": "9",
"opera": "75",
"ios_saf": "9",
"android": "88",
"op_mob": "64",
"and_chr": "88",
"and_ff": "84",
"samsung": "15"
},
"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/postcss/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,
"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"
}
],
"browser_support": {},
"vendors_implementations": 0
},
{
"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": {
"chrome": "78",
"and_chr": "78",
"edge": "79",
"firefox": "70",
"samsung": "12.0",
"android": "78"
},
"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": 2
},
{
"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": {
"chrome": "68",
"and_chr": "68",
"edge": "79",
"firefox": "61",
"and_ff": "61",
"opera": "55",
"op_mob": "48",
"samsung": "10.0",
"android": "68"
},
"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": 2
},
{
"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": {
"edge": "18",
"firefox": "49",
"chrome": "23",
"safari": "6.1",
"opera": "12.1",
"ios_saf": "7",
"android": "4.4",
"bb": "10",
"op_mob": "64",
"and_chr": "23",
"and_ff": "49",
"and_uc": "12.12",
"samsung": "4",
"and_qq": "10.4",
"baidu": "7.12"
},
"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": 1,
"browser_support": {
"edge": "79",
"firefox": "59",
"chrome": "65",
"opera": "52",
"android": "65",
"op_mob": "64",
"and_chr": "65",
"and_ff": "59",
"samsung": "8.2",
"and_qq": "10.4"
},
"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": 2
},
{
"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": {
"chrome": "59",
"and_chr": "59",
"edge": "79",
"firefox": "53",
"and_ff": "53",
"opera": "46",
"op_mob": "43",
"safari": "11",
"ios_saf": "11",
"samsung": "7.0",
"android": "59"
},
"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": {
"edge": "79",
"firefox": "67",
"chrome": "76",
"safari": "12.1",
"opera": "62",
"ios_saf": "13",
"android": "76",
"op_mob": "64",
"and_chr": "76",
"and_ff": "67",
"samsung": "12"
},
"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": {
"edge": "79",
"firefox": "63",
"chrome": "74",
"safari": "10.1",
"opera": "64",
"ios_saf": "10.3",
"android": "74",
"op_mob": "64",
"and_chr": "74",
"and_ff": "63",
"samsung": "11.1"
},
"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": {
"edge": "13",
"firefox": "78",
"chrome": "36",
"safari": "9",
"opera": "23",
"ios_saf": "9",
"android": "36",
"bb": "10",
"op_mob": "64",
"and_chr": "36",
"and_ff": "78",
"and_uc": "12.12",
"samsung": "4",
"and_qq": "10.4",
"baidu": "7.12"
},
"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": {
"edge": "12",
"firefox": "33",
"chrome": "38",
"safari": "7",
"opera": "25",
"ios_saf": "8",
"android": "4.4",
"op_mob": "64",
"and_chr": "38",
"and_ff": "33",
"and_uc": "12.12",
"samsung": "4",
"and_qq": "10.4",
"baidu": "7.12",
"kaios": "2.5"
},
"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": "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": {
"edge": "79",
"firefox": "92",
"chrome": "56",
"safari": "11",
"opera": "43",
"ios_saf": "11",
"android": "56",
"op_mob": "64",
"and_chr": "56",
"and_ff": "92",
"and_uc": "12.12",
"samsung": "6.2",
"and_qq": "10.4"
},
"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": "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": {
"chrome": "41",
"and_chr": "41",
"edge": "13",
"firefox": "27",
"and_ff": "27",
"opera": "28",
"op_mob": "28",
"safari": "9.1",
"ios_saf": "9.3",
"samsung": "4.0",
"android": "41"
},
"docs": {
"mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/unset"
},
"example": "div {\n border-color: unset;\n color: unset;\n}",
"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": {
"chrome": "88",
"and_chr": "88",
"edge": "88",
"firefox": "82",
"and_ff": "82",
"opera": "74",
"op_mob": "63",
"safari": "14",
"ios_saf": "14",
"samsung": "15.0",
"android": "88"
},
"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
}
]