CSS reference
Use this CSS reference to browse an alphabetical index of all of the standard CSS properties, pseudo-classes, pseudo-elements, data types, functional notations and at-rules. You can also browse key CSS concepts and a list of selectors organized by type. Also included is a brief DOM-CSS / CSSOM reference.
Basic rule syntax
Style rule syntax
style-rule ::= selectors-list properties-list > selectors-list ::= selector[:pseudo-class] [::pseudo-element] [, selectors-list] properties-list ::= [property : value] [; properties-list]
See the index of selectors, pseudo-classes, and pseudo-elements below. The syntax for each specified value depends on the data type defined for each specified property.
Style rule examples
strong color: red; > div.menu-bar li:hover > ul display: block; > For a beginner-level introduction to the syntax of selectors, see our guide on CSS Selectors. Be aware that any syntax error in a rule definition invalidates the entire rule. Invalid rules are ignored by the browser. Note that CSS rule definitions are entirely (ASCII) text-based, whereas DOM-CSS / CSSOM (the rule management system) is object-based.
At-rule syntax
As the structure of at-rules varies widely, please see At-rule to find the syntax of the specific one you want.
Index
Note: This index does not include SVG-exclusive presentation attributes, which can be used as CSS properties on SVG elements.
Note: The property names in this index do not include the JavaScript names which do differ from the CSS standard names.
A
- abs()
- accent-color
- acos()
- :active
- additive-symbols (@counter-style)
- ::after (:after)
- align-content
- align-items
- align-self
- align-tracks
- all
- animation
- animation-composition
- animation-delay
- animation-direction
- animation-duration
- animation-fill-mode
- animation-iteration-count
- animation-name
- animation-play-state
- animation-timeline
- animation-timing-function
- @annotation
- annotation()
- :any-link
- appearance
- ascent-override (@font-face)
- asin()
- aspect-ratio
- atan()
- atan2()
- attr()
B
- ::backdrop
- backdrop-filter
- backface-visibility
- background
- background-attachment
- background-blend-mode
- background-clip
- background-color
- background-image
- background-origin
- background-position
- background-position-x
- background-position-y
- background-repeat
- background-size
- base-palette (@font-palette-values)
- ::before (:before)
- :blank
- bleed (@page)
- block-overflow
- block-size
- blur()
- border
- border-block
- border-block-color
- border-block-end
- border-block-end-color
- border-block-end-style
- border-block-end-width
- border-block-start
- border-block-start-color
- border-block-start-style
- border-block-start-width
- border-block-style
- border-block-width
- border-bottom
- border-bottom-color
- border-bottom-left-radius
- border-bottom-right-radius
- border-bottom-style
- border-bottom-width
- border-collapse
- border-color
- border-end-end-radius
- border-end-start-radius
- border-image
- border-image-outset
- border-image-repeat
- border-image-slice
- border-image-source
- border-image-width
- border-inline
- border-inline-color
- border-inline-end
- border-inline-end-color
- border-inline-end-style
- border-inline-end-width
- border-inline-start
- border-inline-start-color
- border-inline-start-style
- border-inline-start-width
- border-inline-style
- border-inline-width
- border-left
- border-left-color
- border-left-style
- border-left-width
- border-radius
- border-right
- border-right-color
- border-right-style
- border-right-width
- border-spacing
- border-start-end-radius
- border-start-start-radius
- border-style
- border-top
- border-top-color
- border-top-left-radius
- border-top-right-radius
- border-top-style
- border-top-width
- border-width
- bottom
- @bottom-center
- box-decoration-break
- box-shadow
- box-sizing
- break-after
- break-before
- break-inside
- brightness()
C
D
E
F
- fallback (@counter-style)
- filter
- :first
- :first-child
- ::first-letter (:first-letter)
- ::first-line (:first-line)
- :first-of-type
- fit-content()
- flex
- flex-basis
- flex-direction
- flex-flow
- flex-grow
- flex-shrink
- flex-wrap
- flex_value#fr
- float
- :focus
- :focus-visible
- :focus-within
- font
- font-display (@font-face)
- @font-face
- font-family
- font-family (@font-face)
- font-family (@font-palette-values)
- font-feature-settings
- font-feature-settings (@font-face)
- @font-feature-values
- font-kerning
- font-language-override
- font-optical-sizing
- font-palette
- @font-palette-values
- font-size
- font-size-adjust
- font-stretch
- font-stretch (@font-face)
- font-style
- font-style (@font-face)
- font-synthesis
- font-variant
- font-variant (@font-face)
- font-variant-alternates
- font-variant-caps
- font-variant-east-asian
- font-variant-emoji
- font-variant-ligatures
- font-variant-numeric
- font-variant-position
- font-variation-settings
- font-variation-settings (@font-face)
- font-weight
- font-weight (@font-face)
- forced-color-adjust
- format()
- :fullscreen
- :future
G
- angle#grad
- gap
- ::grammar-error
- grayscale()
- grid
- grid-area
- grid-auto-columns
- grid-auto-flow
- grid-auto-rows
- grid-column
- grid-column-end
- grid-column-start
- grid-row
- grid-row-end
- grid-row-start
- grid-template
- grid-template-areas
- grid-template-columns
- grid-template-rows
H
I
J
K
L
M
- length#mm
- margin
- margin-block
- margin-block-end
- margin-block-start
- margin-bottom
- margin-inline
- margin-inline-end
- margin-inline-start
- margin-left
- margin-right
- margin-top
- margin-trim
- ::marker
- marks (@page)
- mask
- mask-border
- mask-border-mode
- mask-border-outset
- mask-border-repeat
- mask-border-slice
- mask-border-source
- mask-border-width
- mask-clip
- mask-composite
- mask-image
- mask-mode
- mask-origin
- mask-position
- mask-repeat
- mask-size
- mask-type
- masonry-auto-flow
- math-depth
- math-shift
- math-style
- matrix()
- matrix3d()
- max()
- max-block-size
- max-height
- max-height (@viewport)
- max-inline-size
- max-lines
- max-width
- max-width (@viewport)
- max-zoom (@viewport)
- @media
- min()
- min-block-size
- min-height
- min-height (@viewport)
- min-inline-size
- min-width
- min-width (@viewport)
- min-zoom (@viewport)
- minmax()
- mix-blend-mode
- mod()
- time#ms
N
O
- object-fit
- object-position
- offset
- offset-anchor
- offset-distance
- offset-path
- offset-position
- offset-rotate
- :only-child
- :only-of-type
- opacity
- opacity()
- :optional
- order
- orientation (@viewport)
- @ornaments
- ornaments()
- orphans
- :out-of-range
- outline
- outline-color
- outline-offset
- outline-style
- outline-width
- overflow-anchor
- overflow-block
- overflow-clip-margin
- overflow-inline
- overflow-wrap
- overflow-x
- overflow-y
- override-colors (@font-palette-values)
- overscroll-behavior
- overscroll-behavior-block
- overscroll-behavior-inline
- overscroll-behavior-x
- overscroll-behavior-y
P
- Pseudo-classes
- Pseudo-elements
- length#pc
- length#pt
- length#px
- pad (@counter-style)
- padding
- padding-block
- padding-block-end
- padding-block-start
- padding-bottom
- padding-inline
- padding-inline-end
- padding-inline-start
- padding-left
- padding-right
- padding-top
- @page
- page
- page-break-after
- page-break-before
- page-break-inside
- page-orientation (@page)
- paint()
- paint-order
- ::part
- :past
- path()
- :paused
- perspective
- perspective()
- perspective-origin
- :picture-in-picture
- place-content
- place-items
- place-self
- ::placeholder
- :placeholder-shown
- :playing
- pointer-events
- polygon()
- position
- pow()
- prefix (@counter-style)
- print-color-adjust
- @property
Q
R
S
- saturate()
- scale
- scale()
- scale3d()
- scaleX()
- scaleY()
- scaleZ()
- :scope
- scroll()
- scroll-behavior
- scroll-margin
- scroll-margin-block
- scroll-margin-block-end
- scroll-margin-block-start
- scroll-margin-bottom
- scroll-margin-inline
- scroll-margin-inline-end
- scroll-margin-inline-start
- scroll-margin-left
- scroll-margin-right
- scroll-margin-top
- scroll-padding
- scroll-padding-block
- scroll-padding-block-end
- scroll-padding-block-start
- scroll-padding-bottom
- scroll-padding-inline
- scroll-padding-inline-end
- scroll-padding-inline-start
- scroll-padding-left
- scroll-padding-right
- scroll-padding-top
- scroll-snap-align
- scroll-snap-stop
- scroll-snap-type
- @scroll-timeline
- scroll-timeline
- scroll-timeline-axis
- scroll-timeline-name
- scrollbar-color
- scrollbar-gutter
- scrollbar-width
- ::selection
- selector()
- sepia()
- shape-image-threshold
- shape-margin
- shape-outside
- sign()
- sin()
- size (@page)
- size-adjust (@font-face)
- skew()
- skewX()
- skewY()
- ::slotted
- speak-as (@counter-style)
- ::spelling-error
- sqrt()
- src (@font-face)
- steps()
- @styleset
- styleset()
- @stylistic
- stylistic()
- suffix (@counter-style)
- @supports
- supports() (@import)
- @swash
- swash()
- symbols (@counter-style)
- symbols()
- syntax (@property)
- system (@counter-style)
- time#s
T
- angle#turn
- tab-size
- table-layout
- tan()
- :target
- target-counter()
- target-counters()
- ::target-text
- target-text()
- :target-within
- text-align
- text-align-last
- text-combine-upright
- text-decoration
- text-decoration-color
- text-decoration-line
- text-decoration-skip
- text-decoration-skip-ink
- text-decoration-style
- text-decoration-thickness
- text-emphasis
- text-emphasis-color
- text-emphasis-position
- text-emphasis-style
- text-indent
- text-justify
- text-orientation
- text-overflow
- text-rendering
- text-shadow
- text-size-adjust
- text-transform
- text-underline-offset
- text-underline-position
- top
- @top-center
- touch-action
- transform
- transform-box
- transform-origin
- transform-style
- transition
- transition-delay
- transition-duration
- transition-property
- transition-timing-function
- translate
- translate()
- translate3d()
- translateX()
- translateY()
- translateZ()
- type()
U
V
- length#vh
- length#vmax
- length#vmin
- length#vw
- :valid
- var()
- vertical-align
- ::view-transition
- ::view-transition-group
- ::view-transition-image-pair
- view-transition-name
- ::view-transition-new
- ::view-transition-old
- @viewport
- viewport-fit (@viewport)
- visibility
- :visited
W
X
Z
Others
Selectors
The following are the various selectors, which allow styles to be conditional based on various features of elements within the DOM.
Basic selectors
Basic selectors are fundamental selectors; these are the most basic selectors that are frequently combined to create other, more complex selectors.
Grouping selectors
Specifies that both A and B elements are selected. This is a grouping method to select several matching elements.
Combinators
Combinators are selectors that establish a relationship between two or more simple selectors, such as » A is a child of B » or » A is adjacent to B «, creating a complex selector.
Specifies that the elements selected by both A and B have the same parent and that the element selected by B immediately follows the element selected by A horizontally.
Specifies that the elements selected by both A and B share the same parent and that the element selected by A comes before—but not necessarily immediately before—the element selected by B .
Specifies that the element selected by B is the direct child of the element selected by A .
Specifies that the element selected by B is a descendant of the element selected by A , but is not necessarily a direct child.
Specifies that the element selected by B is located within the table column specified by A . Elements which span multiple columns are considered to be a member of all of those columns.
Pseudo
Specifies a special state of the selected element(s).
Represents entities that are not included in HTML.