| Keyword | Status | Description | Comment |
|---|---|---|---|
| :above-level | WD | Matches an element with presentation level higher than the browser’s presentation level | WD from 2003, flagged as inactive |
| accelerator | nonstd | Specifies whether the element is a keyboard shortcut | Implemented in IE with -ms- prefix. |
| accesskey | nonstd | Assigns an access key to the element | Defined and implemented in some browsers with -wap- prefix. |
| :active | CSS 2.1 | Matches when an element is being activated by user | |
| additive-symbols | WD | Specifies the symbols used by the marker-construction algorithm specified by the ‘system’ descriptor | |
| ::after | CSS 2.1 | Matches an added unnamed child at the end of the selected element | |
| -ah- | nonstd | Vendor prefix for Antenna House | |
| align-content | CR | Aligns a flex container’s lines | Also in more general context in WD CSS Box Alignment Module Level 3 http://www.w3.org/TR/css3-align/ |
| align-items | CR | Aligns flex items of the current flex line | Also in more general context in WD CSS Box Alignment Module Level 3 http://www.w3.org/TR/css3-align/ |
| alignment-adjust | WD | Specifies the position of the baseline identified by alignment-baseline | No implementations; WD (2002) effectively abandonded |
| alignment-baseline | WD | Specifies how an inline-level element is aligned with respect to its parent | No implementations; WD (2002) effectively abandonded |
| align-self | CR | Aligns flex items of the current flex line overriding the align-items value | Also in more general context in WD CSS Box Alignment Module Level 3 http://www.w3.org/TR/css3-align/ |
| all | WD | Sets all CSS properties (to initial, inherit, or default value) | As media keyword (in @media all), refers to all media types |
| ::alternate | WD | A pseudo-element created by setting its 'move-to' property to an identifier; rendered at the next occurrence of 'pending()' in a 'content' property | Outdated WD (2003) |
| anchor-point | CR | Specifies a point to which dialog boxes are to be aligned | Defined now in HTML5 CR. Intended to be moved to a CSS spec. |
| <angle> | CR | Metanotation for data type representing angle values | |
| animation | WD | Shorthand for animation properties | |
| animation-delay | WD | Specifies the delay before starting an animation | |
| animation-direction | WD | Indicates whether the animation should play normally, in reverse, or alternatingly | |
| animation-duration | WD | Specifies the length of time that an animation takes to complete a cycle | |
| animation-fill-mode | WD | Specifies how an animation should apply styles to its target before and after it is executing | |
| animation-iteration-count | WD | Specifies the number of iterations of an animation | |
| animation-name | WD | Assigns a name to an animation | |
| animation-play-state | WD | State of the animation (running or paused) | |
| animation-timing-function | WD | Sets a timing function for the animation | |
| ::anonymous-block | nonstd | Firefox | |
| ::anonymous-positioned-block | nonstd | Firefox | |
| :any() | nonstd | Matches any of the selectors specified as arguments | To be standardized under the name :matches() |
| :any-link | WD | Matches any link (:link or :visited) | |
| appearance | withdr. | Sets the overall appearance of the element according to platform and theme | Also supported (as prefixed) on WebKit, http://css-infos.net/property/-webkit-appearance |
| -apple- | nonstd | Vendor prefix for Apple | |
| app-region | nonstd | webkit | |
| aspect-ratio | nonstd | webkit | |
| aspect-ratio @? | REC | Tests the width/height ratio of the display area for equality to a value | |
| :at-level | WD | Matches an element with the same presentation level as the browser’s presentation level | WD from 2003, flagged as inactive |
| -atsc- | nonstd | Vendor prefix for Advanced Television Standards Committee | |
| attr() | CSS 2.1 | The value of an attribute of the selected element | |
| auto | CSS 2.1 | A value to be automatically computed by browser | |
| azimuth | withdr. | Specifies the azimuth of voice | |
| ::backdrop | WHAT | A box rendered immediately below the element within the same top layer | |
| backface-visibility | WD | Specifies whether back face of an element is visible when facing the user due to 3D transform | |
| background | CSS 2.1 | Shorthand for background properties | |
| background-attachment | CSS 2.1 | Specifies whether background image is fixed or scrolls | |
| background-clip | CR | Specifies whether background extends underneath border | |
| background-color | CSS 2.1 | Sets background color | |
| background-composite | nonstd | Sets a compositing style for background images and colors. | webkit |
| background-image | CSS 2.1 | Sets background image | |
| background-inline-policy | nonstd | Like box-decoration-break but does not apply to borders | |
| background-origin | CSS 2.1 | Sets the origin of background positioning area | |
| background-origin-x | nonstd | Sets x coordinate of origin of background positioning area | webkit, unprefixed! |
| background-origin-y | nonstd | Sets y coordinate of origin of background positioning area | webkit, unprefixed! |
| background-position | CSS 2.1 | Sets the initial position of background image | |
| background-position-x | propos. | Sets the x coordinate of the initial position of background image | In IE: http://msdn.microsoft.com/en-US/library/ie/ms530719.aspx |
| background-position-y | propos. | Sets the y coordinate of the initial position of background image | In IE: http://msdn.microsoft.com/en-US/library/ie/ms530720.aspx |
| background-repeat | CSS 2.1 | Specifies whether and how background image is repeated | |
| background-size | CR | Specifies the sizes of background images | |
| baseline-shift | WD | Specifies the baseline relative to the dominant-baseline | No implementations; WD (2002) effectively abandonded |
| ::before | CSS 2.1 | Matches an added unnamed child at the start of the selected element | |
| behavior | nonstd | Specifies the dynamic (scripted) behavior of the element | |
| :below-level | WD | Matches an element with a lowert presentation level than the browser’s presentation level | WD from 2003, flagged as inactive |
| binding | withdr. | “Behavioral Extensions to CSS” http://www.w3.org/TR/becss/#the-binding is flagged as abandoned at http://www.w3.org/Style/CSS/current-work.en.html | |
| :blank | WD | Matches a blank page in print media | |
| bleed | WD | Specifies the extent of the page bleed area outside the page box | |
| blend-mode | nonstd | webkit | |
| block-progression | nonstd | the block progression and layout orientation (vertical and horizontal) | IE |
| bookmark-label | WD | Specifies the text that will represent a bookmark in a bookmark structure (an index) | |
| bookmark-level | WD | Specifies the level of a bookmark in a hierarchical bookmark structure (an index) | |
| bookmark-state | WD | Specifies the initial state of a bookmark in a bookmark structure (an index) | |
| bookmark-target | WD | Specifies the target of a bookmark in a bookmark structure (an index) | |
| border | CSS 2.1 | Shorthand for border properties | |
| border-after | nonstd | webkit | |
| border-after-color | nonstd | webkit | |
| border-after-style | nonstd | webkit | |
| border-after-width | nonstd | webkit | |
| border-before | nonstd | webkit | |
| border-before-color | nonstd | webkit | |
| border-before-style | nonstd | webkit | |
| border-before-width | nonstd | webkit | |
| border-bottom | CSS 2.1 | Sets the bottom border | |
| border-bottom-color | CSS 2.1 | Sets the color of the bottom border | |
| border-bottom-colors | nonstd | Sets a list of colors for the bottom border | |
| border-bottom-left-radius | CR | Sets the rounding of the bottom-left corner | |
| border-bottom-right-radius | CR | Sets the rounding of the bottom-right corner | |
| border-bottom-style | CSS 2.1 | Sets the style of the bottom border | |
| border-bottom-width | CSS 2.1 | Sets the width of the bottom border | |
| border-clip | ed. | Shorthand for border clip properties | |
| border-clip-bottom | ed. | Splits the bottom border into visible and invisible parts along the border edge | |
| border-clip-left | ed. | Splits the left border into visible and invisible parts along the border edge | |
| border-clip-right | ed. | Splits the right border into visible and invisible parts along the border edge | |
| border-clip-top | ed. | Splits the top border into visible and invisible parts along the border edge | |
| border-collapse | CSS 2.1 | Specifies whether adjacent borders collapse in a table | |
| border-color | CSS 2.1 | Sets the color the border | |
| border-end | nonstd | webkit, Firefox | |
| border-end-color | nonstd | webkit, Firefox | |
| border-end-style | nonstd | webkit, Firefox | |
| border-end-width | nonstd | webkit, Firefox | |
| border-fit | nonstd | webkit | |
| border-horizontal-spacing | nonstd | Defines the spacing between the horizontal portion of an element’s border and the content within | webkit |
| border-image | CR | Shorthand for border image properties | |
| border-image-outset | CR | Specifies by which amount the border image area extends beyond the border box | |
| border-image-repeat | CR | Specifies how the middle part of a border image is handled to match the size of the border | |
| border-image-slice | CR | Divides the image specified by border-image-source in nine slices | |
| border-image-source | CR | Specifies the image to use instead of the style of the border | |
| border-image-width | CR | Defines the offset to use for dividing the border image in nine slices | |
| border-left | CSS 2.1 | Sets the left border | |
| border-left-colors | nonstd | Sets a list of colors for the left border | |
| border-left-color | CSS 2.1 | Sets the color of the left border | |
| border-left-style | CSS 2.1 | Sets the style of the left border | |
| border-left-width | CSS 2.1 | Sets the width of the left border | |
| border-radius | CR | Sets the rounding of the borders | |
| border-right | CSS 2.1 | Sets the right border | |
| border-right-color | CSS 2.1 | Sets the color of the right border | |
| border-right-colors | nonstd | Sets a list of colors for the right border | |
| border-right-style | CSS 2.1 | Sets the style of the right border | |
| border-right-width | CSS 2.1 | Sets the width of the right border | |
| border-spacing | CSS 2.1 | Sets the spacing between borders in a table | |
| border-start | nonstd | Firefox | |
| border-start-color | nonstd | Firefox | |
| border-start-style | nonstd | Firefox | |
| border-start-width | nonstd | Firefox | |
| border-style | CSS 2.1 | Sets the style of borders | |
| border-top | CSS 2.1 | Sets the top border | |
| border-top-color | CSS 2.1 | Sets the color of the top border | |
| border-top-colors | nonstd | Sets a list of colors for the top border | |
| border-top-left-radius | CR | Sets the rounding of the top-left corner | |
| border-top-right-radius | CR | Sets the rounding of the top-right corner | |
| border-top-style | CSS 2.1 | Sets the style of the top border | |
| border-top-width | CSS 2.1 | Sets the width of the top border | |
| border-vertical-spacing | nonstd | Defines the spacing between the vertical portion of an element’s border and the content within | webkit |
| border-width | CSS 2.1 | Sets the width of the border | |
| bottom | CSS 2.1 | Sets bottom displacement for a positioned element | |
| :bound-element | withdr. | Matches the bound element of the binding in which this pseudo-class is used | Firefox |
| box-align | withdr. | Specifies how an element aligns its contents across (perpendicular to) the direction of its layout. | |
| box-decoration-break | CR | Specifies whether the fragments of a box, when broken, are treated as parts of one box or as individually wrapped, with border and padding | |
| box-direction | nonstd | Specifies the direction in which child elements of a flexible box element are laid out | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/box-direction?redirectlocale=en-US&redirectslug=CSS%2F-moz-box-direction |
| box-flex | nonstd | Specifies the flexibility of the element | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/-moz-box-flex |
| box-flex-group | nonstd | Specifies the group number of the element, for a group of dynamically resizing elements that are adjusted to be the same size | webkit |
| box-lines | nonstd | Specifies whether a flexible box should contain multiple lines of conten | webkit |
| box-ordinal-group | nonstd | Specifies a rough ordering of elements in a flexible bo | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/-moz-box-ordinal-group |
| box-orient | nonstd | Specifies the layout of elements nested within a flexible box element | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/box-orient?redirectlocale=en-US&redirectslug=CSS%2F-moz-box-orient |
| box-pack | nonstd | Specifies alignment of child elements within the current element in the direction of orientation | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/-moz-box-pack |
| box-reflect | nonstd | Reflects the content of the element in one direction (above, below, right, left) | WebKit |
| box-shadow | CR | Specifies one or more shadow effects for a box | |
| box-sizing | WD | Specifies the box model used to calculate widths and heights | |
| box-snap | ed. | Specifies which edges, if any, are snapped to the line grid | |
| break-after | CR | Affects page or column breaks after the element | |
| break-before | CR | Affects page or column breaks before the element | |
| break-inside | CR | Affects page or column breaks inside the element | |
| :broken | nonstd | Matches an element representing a broken image link | |
| ::browse | nonstd | Matches the browse button in a file input control | IE |
| calc() | CR | Functional notation that yields a calculated value of an expression | |
| ::canvas | nonstd | Firefox | |
| canvas() | nonstd | Denotes the rendered content of a canvas as an image (for use as background image) | |
| caption-side | CSS 2.1 | Positions the caption of a table on the specified side | |
| ::cell-content | nonstd | Firefox | |
| ch | CR | Unit corresponding to the advance measure of digit zero “0” | |
| chains | WD | Chains slots in template layout so that content flows from one slot to another | |
| @charset | CSS 2.1 | Specifies the character encoding of the style sheet | |
| ::check | nonstd | Matches the check of a checkbox or radio button input control | IE |
| :checked | REC | Matches a form field in checked (selected) state | |
| ::choices | WD | Stands for the choices (excluding labels) in a list of options | |
| clear | CSS 2.1 | Specifies how floating is cleared | |
| ::clear | nonstd | Matches the clear button in a text input control, appearing when the control has focus and is not empty | IE |
| clip | CSS 2.1 | Specifies which part of an absolutely positioned element is visible | Also defined, as deprecated, in WD http://www.w3.org/TR/css-masking/#ClipProperty |
| clip-path | WD | Sets the clipping region | Also defined in SVG 1.1. See also https://developer.mozilla.org/en-US/docs/CSS/clip-path |
| clip-rule | WD | Sets a ‘nonzeo’ or ‘evenodd’ clipping rule on a clipping path | |
| cm | CSS 2.1 | Unit nominally corresponding to a centimeter | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| color | CSS 2.1 | Sets the content (text) color | |
| color @? | REC | Tests the number of bits per color being equal to a value | |
| <color> | CSS 2.1 | Metanotation for data type representing color values | |
| color-correction | ed. | Specifies the color space of CSS colors and colors in untagged images | |
| color-index @? | REC | Tests the number of entries in the color lookup table for being equal to a value | |
| color-profile | withdr. | Specifies the color profile | Dropped from CSS3 Colors in the REC, see http://www.w3.org/TR/css3-color/#dropped |
| @color-profile | withdr. | Specifies a set of color profile descriptions | Dropped from CSS3 Colors in the REC, see http://www.w3.org/TR/css3-color/#dropped |
| ::column() | WD | Matches the part of an element that ends up on a certain column of the element | |
| column-axis | nonstd | Chrome | |
| column-break-after | nonstd | Determines whether a column break can and should occur after an element in a multicolumn flow layout | webkit |
| column-break-before | nonstd | Determines whether a column break can and should occur before an element in a multicolumn flow layout | webkit |
| column-break-inside | nonstd | Determines whether a column break should be avoided within the bounds of an element in a multicolumn flow layout. | webkit |
| column-count | CR | Sets the number of columns | |
| column-fill | CR | Specifies whether columns are balanced or just take up the room the content needs | |
| column-gap | CR | Sets the width of the gap between columns | |
| column-progression | nonstd | ||
| column-rule | CR | Shorthand notation for column rule properties | |
| column-rule-color | CR | Sets the color of the rules between columns | |
| column-rule-style | CR | Sets the style of the rules between columns | |
| column-rule-width | CR | Sets the width of the rules between columns | |
| columns | CR | Shorthand notation for column width and count | |
| column-span | CR | Specifies whether an element spans all columns | |
| column-width | CR | Suggests a width for columns | Additions at http://www.w3.org/TR/css3-sizing/#column-sizing |
| :contains() | withdr. | Selects elements based on their text content | Was proposed, now withdrawn. |
| content | CSS 2.1 | Sets the content of a pseudo-element or element | |
| content-zoom-chaining | nonstd | Specifies the zoom behavior that occurs when a user hits the zoom limit during a manipulation | IE |
| content-zooming | nonstd | Specifies whether zooming is enabled | IE |
| content-zoom-limit | nonstd | A shortcut for content-zoom-limit-min and ms-content-zoom-limit-max | IE |
| content-zoom-limit-max | nonstd | Specifies the maximum zoom factor | IE |
| content-zoom-limit-min | nonstd | Specifies the minimum zoom factor | IE |
| content-zoom-snap | nonstd | A shortcut for content-zoom-snap-type and content-zoom-snap-points | IE |
| content-zoom-snap-points | nonstd | Defines where zoom snap-points are located | IE |
| content-zoom-snap-type | nonstd | Specifies how zooming is affected by defined snap-points | IE |
| @counter | WD | Specifies a block of counter definitions (?) | Outdated WD (2003), “syntax still to come” |
| counter() | CSS 2.1 | Yields the value of a counter | |
| counter-increment | CSS 2.1 | Increments a counter | |
| counter-reset | CSS 2.1 | Sets a counter to a specific value | |
| counters() | CSS 2.1 | Yields a value composed of counter values | |
| @counter-style | WD | Defines a custom counter style | |
| crop | WD | Sets a replaced element to a rectangular area of the object, rather than the entire object | Outdated WD (2003) |
| cross-fade() | nonstd | ||
| cubic-bezier() | WD | Functional notation that defines a cubic Bézier curve | |
| cue | CR | Shorthand for cue-before and cue-after | http://www.w3.org/TR/CSS2/aural.html#propdef-cue |
| cue-after | CR | Specifies sound to be presented after the element | http://www.w3.org/TR/CSS2/aural.html#propdef-cue-after |
| cue-before | CR | Specifies sound to be presented before the element | http://www.w3.org/TR/CSS2/aural.html#propdef-cue-before |
| :current | WD | Matches the innermost element, or ancestor of an element, that is currently being rendered (e.g., spoken) | |
| cursor | CSS 2.1 | Sets the shape of the mouse pointer | |
| cycle() | withdr. | An expression that cycles over a list of values for nested elements | Has been renamed to toggle() |
| dashboard-region | nonstd | Specifies the behavior of regions in a Dashboard widget | webkit |
| default | WD | Rolls back the cascade | |
| :default | WD | Matches user interface element that is the default among a group of similar elements | |
| deg | CR | Unit of angle, corresponding to a degree (1/360 of a circle) | |
| device-aspect-ratio @? | REC | Tests the width/height ratio of the device for equality to a value | |
| device-cmyk() | WD | Defines a color as a device-dependent CMYK color | |
| device-pixel-ratio @? | nonstd | Test the number of CSS reference pixels per physical device pixel | Opera, WebKit (with prefix), Firefox (with prefix): https://developer.mozilla.org/en-US/docs/CSS/Media_queries#-moz-device-pixel-ratio |
| device-width @? | REC | Tests width of device’s rendering surface for equality to a value | |
| :dir() | WD | Matches elements with the specified directionality | |
| direction | CSS 2.1 | Sets the base directionality (left to right or right to left) | |
| :disabled | REC | Matches elements in disabled state | |
| display | CSS 2.1 | Sets the type of rendering box, e.g. inline or block | |
| display-box | ed. | Specifies whether and how the element creates boxes | |
| display-extras | ed. | Specifies whether the element is a list item that generates a ::marker pseudo-element | |
| display-inside | ed. | Sets the layout mode of the content of the element | |
| display-outside | ed. | Sets the way the element behaves in layout context | |
| @document | WD | Restricts the effect of rules by the URL of the document | According to Editor’s draft, to be postponed to Level 4. |
| dominant-baseline | WD | Specifies a scaled-baseline-table | No implementations; WD (2002) effectively abandonded |
| dpcm | REC | Unit denoting dots per centimeter | http://www.w3.org/TR/css3-values/#dpcm |
| dpi | REC | Unit denoting dots per inch | http://www.w3.org/TR/css3-values/#dpi |
| dppx | CR | Unit denoting dots per pixel (px unit) | |
| :drag-over | nonstd | Matches an element when a drag-over event is called on it | |
| drop-initial-after-adjust | WD | Sets the alignment point of the drop initial for the primary connection point | No implementations; WD (2002) effectively abandonded |
| drop-initial-after-align | WD | Determines which alignment line within the nth line box (n being defined by the 'drop-initial-value' property) is used at the primary connection point with the initial letter box | No implementations; WD (2002) effectively abandonded |
| drop-initial-before-adjust | WD | Sets the alignment point of the drop initial for the secondary connection point | No implementations; WD (2002) effectively abandonded |
| drop-initial-before-align | WD | Determines which alignment line within the initial line box is used at the secondary connection point with the initial letter box | No implementations; WD (2002) effectively abandonded |
| drop-initial-size | WD | Controls the partial sinking of the initial letter | No implementations; WD (2002) effectively abandonded |
| drop-initial-value | WD | Activates a drop-initial effect | No implementations; WD (2002) effectively abandonded |
| element() | WD | Yields the value of a running element, i.e. an element with position: running() | Also: Defines an image value generated from an element; withdrawn; see https://developer.mozilla.org/en-US/docs/CSS/element |
| elevation | withdr. | Specifies the elevation of voice | |
| em | CSS 2.1 | Unit corresponding to the size (height) of the font | |
| :empty | REC | Matches an element with empty content | |
| empty-cells | CSS 2.1 | Specifies whether background and borders apply to empty cells | |
| :enabled | REC | Matches elements in enabled state | |
| -epub- | nonstd | Vendor prefix for EPUB Working Group | |
| ex | CSS 2.1 | Unit corresponding to the x-height of the font | |
| ::expand | nonstd | Matches the drop-down button of a select control | IE |
| expression() | nonstd | Yields the computed value of its argument | IE; from IE 8, works in Quirks Mode only |
| fallback | WD | Specifies a fallback counter style to be used when the current counter style can’t create a representation for a given counter value | |
| fill | nonstd | Chrome, without prefix | |
| ::fill | nonstd | Matches a progress control created by an HTML5 progress element | IE |
| ::fill-lower | nonstd | Matches the part of a slider control (input type=range) from the smallest value to the currently selected value | IE |
| fill-opacity | nonstd | Chrome, without prefix | |
| fill-rule | nonstd | Chrome, without prefix | |
| ::fill-upper | nonstd | Matches the part of a slider control (input type=range) from the currently selected value to the largest value | IE |
| filter | WD | Applies filtering effects on an SVG element | This is quite different from the nonstandard filter property in IE 4 thru IE 9, see http://msdn.microsoft.com/en-US/library/ie/ms530752.aspx |
| :first | CSS 2.1 | Matches the first page in print media (@page environment) | |
| :first-child | CSS 2.1 | Matches an element that is the first child in an element | |
| ::first-letter | CSS 2.1 | Matches the first letter in an element | |
| ::first-line | CSS 2.1 | Matches the first rendered line in an element | |
| :first-node | nonstd | Matches an element that is the first node of its parent | |
| :first-of-type | REC | Matches an element that is the first child of its type | |
| ::first-page | WD | Matches the starting page in print media | |
| fit | WD | Gives a hint for how to scale a replaced element if neither its 'width' nor its 'height' property is 'auto' | In a WD (2006) flagged as inactive |
| fit-position | WD | Determines the alignment of the object inside the box | In a WD (2006) flagged as inactive |
| flavor | withdr. | An accent color (typically chosen by the user) to customize the user interface of the user agent itself | Dropped from CSS3 Colors in the REC, see http://www.w3.org/TR/css3-color/#dropped |
| flex | CR | Specifies ability of a flex item to alter their dimensions to fill the available space | Also IE: http://msdn.microsoft.com/en-US/library/ie/jj127297.aspx |
| flex | CR | Value of the display property, causes the element to generate a block-level flex container box | |
| flex-align | withdr. | the alignment (perpendicular to the layout axis defined by the flex-direction property) of child elements of the object | IE; was in a WD: http://www.w3.org/TR/2012/WD-css3-flexbox-20120322/#flex-align |
| flex-basis | CR | Specifies the flex basis which is the initial main size of a flex item | |
| flex-direction | CR | Specifies how flex items are placed in the flex container defining the main-axis and the direction | Also IE: http://msdn.microsoft.com/en-US/library/ie/jj127299.aspx |
| flex-flow | CR | Shorthand property for flex-direction and flex-wrap | |
| flex-grow | CR | Specifies the flex grow factor of a flex item. | |
| flex-order | withdr. | Specifies the ordinal group that a flexbox element belongs to | IE; was in WD: http://go.microsoft.com/fwlink/p/?linkid=223142 |
| flex-pack | withdr. | Specifies how excess space is distributed (along the axis defined by the flex-direction property) between child elements of the object | IE; was in WD: http://msdn.microsoft.com/en-US/library/ie/jj127304.aspx |
| flex-shrink | CR | Specifies the flex shrink factor of a flex item | |
| flex-wrap | CR | Specifies whether the children of a flex item are forced into a single line or wrappable | Also IE: http://msdn.microsoft.com/en-US/library/ie/jj127305.aspx |
| float | CSS 2.1 | Makes the element floating, i.e. taken from the normal flow and placed along the left or right side of its container | |
| float-edge | nonstd | ||
| float-offset | WD | Pushes a float in opposite direction of the where it has been floated with float | |
| flood-color | nonstd | Chrome, without prefix | |
| flood-opacity | nonstd | Chrome, without prefix | |
| flow-from | WD | Makes a block container a region and associates it with a named flow | See also http://msdn.microsoft.com/en-US/library/ie/hh771897.aspx |
| flow-into | WD | Places the element into a named flow | See also http://msdn.microsoft.com/en-US/library/ie/hh771899.aspx |
| :focus | CSS 2.1 | Matches a focused element | |
| :focus-inner | nonstd | Firefox | |
| focus-opacity | nonstd | Opera | |
| :focus-outer | nonstd | Firefox | |
| :focusring | nonstd | Matches an element that is currently focused and should have a focus ring drawn around it | |
| font | CSS 2.1 | A shorthand property for font properties, or sets the font to a system font | |
| font-color | nonstd | Specifies the color of text, like the color property [presumably] | Generated and recognized by Microsoft Office software |
| font-emphasize | nonstd | Shorthand for font-emphasize properties | Generated and recognized by Microsoft Office software |
| font-emphasize-position | nonstd | Specifies the position of the symbol used for emphasis in East Asian texts | Generated and recognized by Microsoft Office software |
| font-emphasize-style | nonstd | Specifies the symbol to be used for emphasis in East Asian texts | Generated and recognized by Microsoft Office software |
| @font-face | WD | Defines a font by identifying font file(s) | |
| font-family | CSS 2.1 | Specifies a preference list of font families | |
| font-feature-settings | WD | Sets OpenType properties | |
| @font-feature-values | WD | Defines names for OpenType font feature values | |
| font-kerning | WD | Enables or disables kerning | |
| font-language-override | WD | Specifies the language of the content, by its OpenType tag, for typographic use | |
| font-size | CSS 2.1 | Sets the size of the font | |
| font-size-adjust | WD | Adjusts the font size according to the x-height value | |
| font-size-delta | nonstd | WebKit; possibly never released: https://bugs.webkit.org/show_bug.cgi?id=50641 | |
| font-smooth | withdr. | Controls the application of anti-aliasing | |
| font-smoothing | nonstd | Controls the application of anti-aliasing | Implemented in WebKit browsers in Mac |
| font-stretch | WD | Selects a normal, condensed, or extended typeface | |
| font-style | CSS 2.1 | Selects normal, italic, or oblique font style | |
| font-synthesis | CSS 2.1 | Controls whether user agents are allowed to synthesize bold or oblique font faces when a font family lacks bold or italic faces | |
| font-variant | CSS 2.1 | Shorthand for font rendering | |
| font-variant-alternates | WD | Specifies how alternate glyph variants are to be used | http://www.w3.org/TR/css3-fonts/#font-variant-ligatures-prop |
| font-variant-caps | WD | Selects a font variant such as small-caps or petite-caps | |
| font-variant-east-asian | WD | Specifies typographic features to be used for East Asian text | |
| font-variant-ligatures | WD | Specifies conditions for using ligatures | |
| font-variant-numeric | WD | Specifies glyph variants for digits | |
| font-variant-position | WD | Specifies whether subscript or superscript glyph variants are to be used | |
| font-weight | CSS 2.1 | Sets the weight (e.g., bold) of the font | |
| footnote | WD | Value of the float property, indicating that the element is moved to the footnote area and a footnote-call pseudo-element is put in its original place; also a reserved counter name | http://www.w3.org/TR/css3-gcpm/#counting-footnotes |
| ::footnote-call | WD | Inserted in place of an element with float: footnote | |
| ::footnote-marker | WD | Added to an element with float: footnote, replacing the ::before pseudo-element | |
| force-broken-image-icon | nonstd | Specifies whether a missing image is indicated with an icon of broken image even when an alt attribute is present | |
| fr | WD | Unit for fraction of available space in grid layout | |
| <frequency> | WD | Metanotation for data type representing frequency values | |
| :fullscreen | WHAT | Matches an element being displayed in full-screen mode | |
| :full-screen | nonstd | Matches an element being displayed in full-screen mode | |
| :full-screen-ancestor | nonstd | Matches an ancestor of an element displayed in full-screen mode | |
| :future | WD | Matches an element that is defined to be rendered entirely after the :current element | |
| gd | ed. | A relative unit used in grids | Also in abandoned WD: http://www.w3.org/TR/css3-grid/#grid-units |
| glyph-orientation-horizontal | nonstd | Chrome, without prefix | |
| glyph-orientation-vertical | nonstd | Chrome, without prefix | |
| grad | CR | Unit of angle, corresponding to a gon, i.e. a grade (1/400 of a circle) | |
| <gradient> | CR | Metanotation for data type representing images defined as gradients | |
| grid @? | REC | Tests whether the output device is grid or bitmap | |
| grid-area | WD | A shorthand for the ‘grid-column-position’, ‘grid-row-position’, ‘grid-column-span’, and ‘grid-row-span’ properties. | |
| grid-auto-columns | WD | Sets the default size of grid columns | |
| grid-auto-flow | WD | Controls the direction in which the search for unoccupied space in grid layout takes place, and whether rows or columns are added | |
| grid-auto-rows | WD | Sets the default size of grid rows | |
| grid-column | WD | Shorthand for the ‘grid-column-position’ and ‘grid-column-span’ properties | See also http://msdn.microsoft.com/en-US/library/ie/hh772242.aspx |
| grid-column-align | withdr. | Specifies the horizontal alignment of the object within the grid column | Was in WD: http://www.w3.org/TR/2012/WD-css3-grid-layout-20120322/ |
| grid-column-position | WD | Specifies the column of the placement of the element in a grid | |
| grid-columns | withdr. | Specifies the number and widths of grid columns | Abandonded WD. The name has been changed to grid-definition-columns in the newer draft “CSS Grid Layout”, but IE 10 implementation is based on the older name: http://msdn.microsoft.com/en-US/library/ie/hh772246.aspx |
| grid-column-span | WD | Specifies how many columns the element spans in a grid | See also http://msdn.microsoft.com/en-US/library/ie/hh772248.aspx |
| grid-definition-columns | WD | Specifies the number and widths of grid columns | Cf. to grid-columns |
| grid-definition-rows | WD | Specifies the number and heights of grid rows | Cf. to grid-rows |
| grid-position | WD | Shorthand for ‘grid-column-position’ and ‘grid-row-position’ | |
| grid-row | WD | Shorthand for ‘grid-row-position’ and ‘grid-row-span’ | See also http://msdn.microsoft.com/en-US/library/ie/hh772254.aspx |
| grid-row-align | withdr. | Specifies the vertical alignment of the object within the grid row | Was in WD: http://www.w3.org/TR/2012/WD-css3-grid-layout-20120322/ |
| grid-row-position | WD | Specifies the row of the placement of the element in a grid | |
| grid-rows | withdr. | Specifies the number and heights of grid rows | Abandonen WD. The name has been changed to grid-definition-rows in the newer draft “CSS Grid Layout”, but IE 10 implementation is based on the older name: http://msdn.microsoft.com/en-US/library/ie/hh772258.aspx |
| grid-row-span | WD | Specifies how many rows the element spans in a grid | See also http://msdn.microsoft.com/en-US/library/ie/hh772260.aspx |
| grid-span | WD | Shorthand for ‘grid-column-span’ and ‘grid-row-span’ | |
| grid-template | WD | Defines names for grid areas, to be specified using the grid-area property | |
| :handler-blocked | nonstd | Matches an element that cannot be displayed because its handler has been blocked | |
| :handler-crashed | nonstd | Matches an element that cannot be displayed because the plugin responsible for drawing it has crashed | |
| :handler-disabled | nonstd | Matches an element that cannot be displayed because its handler has been disabled by the user | |
| hanging-punctuation | WD | Specifies whether a punctuation mark may be placed outside the line box | http://dev.w3.org/csswg/css4-text/#hanging-punctuation0 |
| height | CSS 2.1 | Sets the height of the content area of an element | |
| height @? | REC | Tests height of display area for equality to a value | |
| high-contrast @? | nonstd | Tests whether the application is being displayed in high contrast mode, and with what color variation | IE |
| high-contrast-adjust | nonstd | Specifies whether to override any CSS properties that would have been set in high contrast mode | IE |
| highlight | nonstd | Webkit; characterized as “unsupported” | |
| horiz-align | nonstd | Aligns text horizontally [presumably] | Generated and recognized by Microsoft Office software |
| :hover | CSS 2.1 | Matches an element when the mouse pointer is over it | |
| -hp- | nonstd | Vendor prefix for Hewlett Packard | |
| hsl() | REC | Defines a color using the hue-saturation-lightness model | |
| hsla() | REC | Defines a color using the hue-saturation-lightness-alpha model | |
| hyphenate-character | ed. | Specifies the string that is shown between parts of a word that has been divided into two lines by the browser | |
| hyphenate-limit-after | nonstd | Chrome | |
| hyphenate-limit-before | nonstd | Chrome | |
| hyphenate-limit-chars | ed. | Specifies the minimum number of characters in a hyphenated word | See also http://msdn.microsoft.com/en-US/library/ie/hh771865.aspx |
| hyphenate-limit-last | ed. | Indicates hyphenation behavior at the end of an element, column, page, or spread | |
| hyphenate-limit-lines | ed. | Specifies the maximum number of successive hyphenated lines in an element | See also http://msdn.microsoft.com/en-US/library/ie/hh771867.aspx |
| hyphenate-limit-zone | ed. | Specifies the maximum amount of unfilled space (before justification) that may be left in the line box before hyphenation is triggered to pull part of a word from the next line back up into the This Specifies the maximum amount of unfilled space that may be left in the line box before hyphenation is triggered to pull part of a word from the next line back up into the current line | See also http://msdn.microsoft.com/en-US/library/ie/hh771869.aspx |
| hyphenate-resource | withdr. | Specifies external resources that can help the browser determine hyphenation points | |
| hyphens | WD | Specifies whether hyphenation is to be applied | |
| Hz | CR | Unit of frequency, corresponding to hertz (occurrences per second) | |
| icon | WD | Specifies an iconic equivalent for the element, for use with content: icon | http://www.css666.com/properties/icon.html |
| image() | CR | Denotes an image, to use a media fragment, to specify fallback images, to use solid color as image, or to annotate an image with directionality | At risk |
| <image> | CR | Metanotation for data type representing a 2D image | Firefox |
| image-orientation | CR | Specifies how to correct the default orientation of an image | |
| image-rect() | nonstd | Defines an image as a part of a larger image | Firefox; proposed for WebKit |
| image-region() | nonstd | Defines an image as a part of a larger image, for use in certain contexts | |
| image-rendering | WD | Specifies how image scaling should be performed | |
| image-resolution | CR | Specifies the intrinsic resolution of raster images | |
| image-orientation | CR | Specifies an orthogonal rotation to be applied to the image before it is laid out | |
| images-in-menus @? | nonstd | Tests whether the device allows images to appear in menus | |
| ime-mode | WD | Controls the state of the input method editor for text fields | |
| @import | CSS 2.1 | Inserts the content of a style sheet into the current style sheet | |
| !important | CSS 2.1 | A specifier that gives the declaration higher preference in the cascade | |
| in | CSS 2.1 | Unit nominally corresponding to an inch (25.4 mm) | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| include-source | obsol. | Replaces the content by the content of the document specified by the value | Netscape |
| :indeterminate | WD | Matches checkboxes and progress elements in indeterminate state | |
| inherit | CSS 2.1 | Denotes the computed value of the property for the parent element | |
| initial | CR | Denotes the initial value of the property as defined in CSS specifications | |
| inline-box-align | WD | Specifies which line of a multi-line inline block aligns with the previous and next inline elements within a line | No implementations; WD (2002) effectively abandonded |
| inline-flex | CR | Value of the display property, causes the element to generate an inline-level flex container box | |
| inline-table | CSS 2.1 | Value of the display property, makes the element behave internally as a table, externally as an inline element | |
| ::inline-table | nonstd | ||
| input-format | nonstd | Specifies a pattern that input values must match | Defined and implemented in some browsers with -wap- prefix. |
| :input-placeholder | nonstd | Matches the placeholder text being displayed in a form field | IE |
| ::input-placeholder | nonstd | Matches the placeholder text being displayed in a form field | WebKit |
| input-required | nonstd | Specifies that input data of nonzero length is required | Defined and implemented in some browsers with -wap- prefix. |
| :in-range | WD | Matches fields that satisfy range constraints imposed on them | |
| <integer> | CSS 2.1 | Metanotation for data type representing an integer in decimal notation | |
| interpolation-mode | nonstd | Sets the interpolation (resampling) method used to stretch images | Microsoft-specific ; obsolete according to Microsoft |
| interpret-as | nonstd | -xv- | |
| :invalid | WD | Matches a form field or form that violates validity constraints | |
| justify-items | WD | Sets the default ‘justify-self’ of the grid container's items | |
| justify-content | CR | Aligns flex items in the main-axis of the current line | Also in more general context in WD CSS Box Alignment Module Level 3 http://www.w3.org/TR/css3-align/ |
| justify-self | WD | Justifies the box within its parent along the inline/row axis | |
| kerning | nonstd | Recognized by Chrome, without prefix; effect unknown | |
| :keyboard-active | nonstd | Matches an element when it has focus and the user presses the space bar | IE; only available to content displayed inside a Windows Store app. |
| @keyframes | WD | Specifies the key frames in an animation | |
| -khtml- | nonstd | Vendor prefix for Konqueror | |
| kHz | CR | Unit of frequency, corresponding to kilohertz (1,000 Hz) | |
| :lang() | CSS 2.1 | Matches the elements with declared content language corresponding to the selector | |
| languages | nonstd | Sets the content language of the element [presumably] | Generated and recognized by Microsoft Office software |
| :last-child | REC | Matches an element that is the last child in some element | |
| :last-of-type | REC | Matches an element that is the last child of its type | |
| :last-node | nonstd | Matches an element that is the last child node of an element | |
| layout-flow | nonstd | Sets the direction and flow of the content in the object (horizontal or vertical-ideographic) | Generated and recognized by Microsoft Office software |
| layout-grid | nonstd | A shortcut for grid properties that specify the layout of text characters | IE |
| layout-grid-char | nonstd | Sets the size of the character grid used for rendering the text content of an element | Generated and recognized by Microsoft Office software |
| layout-grid-char-spacing | obsol. | Controls the character spacing granularity when the 'layout-grid-mode' is set to 'char' or 'both', and the 'layout-grid-type' property is set to 'loose' | IE |
| layout-grid-line | nonstd | Sets the gridline value used for rendering the text content of an element | Generated and recognized by Microsoft Office software |
| layout-grid-mode | nonstd | Specifies whether the text layout grid uses two dimensions | Generated and recognized by Microsoft Office software |
| layout-grid-type | nonstd | Sets the type of grid used for rendering the text content of an element | Generated and recognized by Microsoft Office software |
| leader() | WD | Creates a visual pattern that guides the eye, such as leader dots | |
| left | CSS 2.1 | Sets left displacement for a positioned element | |
| :left | CSS 2.1 | Matches a left-side page in print media (@page environment) | |
| <length> | CSS 2.1 | Metanotation for data type representing a length (distance) | |
| letter-spacing | CSS 2.1 | Specifies additional spacing to be applied between text characters | |
| lighting-color | nonstd | Chrome, without prefix | |
| line-align | nonstd | Chrome | |
| linear-gradient | CR | Creates an image that represents a linear gradient of colors | |
| line-box-contain | nonstd | Chrome | |
| line-break | WD | Specifies the strictness of line-breaking rules applied within the element, particularly how line-breaking interacts with punctuation | See also: http://msdn.microsoft.com/en-US/library/ie/ms530782.aspx |
| line-clamp | nonstd | Webkit; characterized as “unsupported” | |
| line-grid | ed. | Specifies which (if any) line grid the line boxes of the element will align to | Chrome |
| line-height | CSS 2.1 | Sets a height used in line box height calculations | |
| ::line-marker | WD | Matches a pseudo-element acting as a marker for each line of a list item | Outdated WD (2003) |
| line-slack | ed. | Specifies the slack in snapping lines to a grid | |
| line-snap | ed. | Causes each line box to shift downward until it snaps to the line grid | Chrome |
| line-stacking | WD | Shorthand for line stacking properties | No implementations; WD (2002) effectively abandonded |
| line-stacking-ruby | WD | Determines the line stacking method for block elements containing ruby annotation elements | No implementations; WD (2002) effectively abandonded |
| line-stacking-shift | WD | Setermines the line stacking method for block elements containing elements with base-shift | No implementations; WD (2002) effectively abandonded |
| line-stacking-strategy | WD | Determines the line stacking strategy for stacked line boxes within a containing block element | No implementations; WD (2002) effectively abandonded |
| link | nonstd | Sets the value of a variable that can be used to create a link with link-source | Opera |
| :link | CSS 2.1 | Matches a link that has not been recently visited | |
| link-source | nonstd | Turns the element to a link (“source anchor”) | Opera |
| ::list-bullet | nonstd | Matches the bullet of a list elemet | With -moz- prefix |
| list-image-1 | nonstd | Generated and recognized by Microsoft Office software | |
| list-image-2 | nonstd | Generated and recognized by Microsoft Office software | |
| list-image-3 | nonstd | Generated and recognized by Microsoft Office software | |
| ::list-number | nonstd | Matches the number of a list elemet | With -moz- prefix |
| list-style-image | CSS 2.1 | Sets the image to be used as list item marker | |
| list-style-position | CSS 2.1 | Sets the position of the list marker box | |
| list-style-type | CSS 2.1 | Sets the list item marker | |
| :loading | nonstd | Matches an element (such as an image) that is not displayed because external content has not started loading (but not elements in the process of loading) | |
| locale | nonstd | Chrome | |
| :locale-dir() | nonstd | Matches an element if the user interface is being displayed in the direction specified by the argument (ltr or rtl) | For extensions and themes; does not work from HTML |
| :local-link | WD | Matches link with href value that coincides with the current page URL entirely or up to n path components, when an argument n is used | |
| logical-height | nonstd | ||
| logical-width | nonstd | ||
| :lwtheme | nonstd | Matches in chrome documents when the root element's lightweightthemes attribute is true and a theme is selected | |
| :lwtheme-darktext | nonstd | Matches in chrome documents when :-moz-lwtheme is true and a lightweight theme with a dark text color is selected | |
| mac-graphite-theme @? | nonstd | Tests whether the user has configured their device to use the ""Graphite"" appearance on Mac OS X | |
| maemo-classic | nonstd | Tests whether the user is using Maemo with the original theme | |
| margin | CSS 2.1 | Shorthand for setting margin properties | |
| margin-after | nonstd | ||
| margin-after-collapse | nonstd | Chrome | |
| margin-before | nonstd | ||
| margin-before-collapse | nonstd | Chrome | |
| margin-bottom | CSS 2.1 | Sets the bottom margin | |
| margin-bottom-collapse | nonstd | Specifies the behavior of an element’s bottom margin if it is adjacent to an element with a margin | webkit |
| margin-collapse | nonstd | Specifies the behavior of an element’s vertical margins if it is adjacent to an element with a margin | webkit |
| margin-end | nonstd | Sets the horizontal margin after the content, depending on directionality | |
| margin-left | CSS 2.1 | Sets the left margin | |
| margin-right | CSS 2.1 | Sets the right margin | |
| margin-start | nonstd | Sets the horizontal margin before the content, depending on directionality | |
| margin-top | CSS 2.1 | Sets the top margin | |
| margin-top-collapse | nonstd | Specifies the behavior of an element’s top margin if it is adjacent to an element with a margin | webkit |
| marker | WD | As a display value, makes the element a list marker | |
| ::marker | WD | Matches a pseudo-element acting as a marker for a list item | Also in outdated WD (2003) http://www.w3.org/TR/css3-content/#block |
| marker-end | nonstd | Chrome, without prefix | |
| marker-mid | nonstd | Chrome, without prefix | |
| marker-start | nonstd | Chrome, without prefix | |
| marks | WD | Adds crop marks (to indicate where the page should be cut) or cross marks (used to align sheets of paper) | |
| marquee | nonstd | Shortcut for marquee properties | WebKit |
| marquee | nonstd | Value of the display property, indicating a box affected by marquee properties | Defined and implemented in some browsers with -wap- prefix. |
| marquee-dir | nonstd | Sets the scrolling or sliding direction for marquee text | WAP, with -wap- prefix. |
| marquee-direction | WD | Sets the scrolling or sliding direction for marquee text | Also described in an outdated W3C draft http://www.w3.org/TR/css3-box/#marquee and (with -wap- prefix) in WAP CSS specification. |
| marquee-increment | nonstd | Specifies the distance between each step of the scrolling marquee in pixels | WebKit |
| marquee-loop | WD | Sets the number of loops for marquee text | Described in an outdated W3C draft and (with -wap- prefix) in WAP CSS specification. |
| marquee-play-count | CR | Specifies how many times the content moves in marquee | |
| marquee-repetition | nonstd | Sets the number of loops for marquee text; same as marquee-loop | WebKit |
| marquee-speed | WD | Sets the speed of scrolling or sliding for marquee text | Also described in an outdated W3C draft http://www.w3.org/TR/css3-box/#marquee and (with -wap- prefix) in WAP CSS specification. |
| marquee-style | CR | Sets the scrolling style of marquee text | Also described in an outdated W3C draft http://www.w3.org/TR/css3-box/#marqueeand (with -wap- prefix) in WAP CSS specification. |
| mask | WD | Shorthand for mask properties | Also defined in SVG 1.1. See also https://developer.mozilla.org/en-US/docs/CSS/mask and http://css3clickchart.com/#masks and https://www.webkit.org/blog/181/css-masks/ |
| mask-attachment | nonstd | Defines the scrolling or fixed nature of the image mask | |
| mask-box-image | WD | Shorthand for mask box properties | |
| mask-box-image-outset | WD | Specifies the amount by which the mask box image area extends beyond the border box | |
| mask-box-image-repeat | WD | Specifies how the images for the sides and the middle part of the mask image are scaled and tiled | |
| mask-box-image-slice | WD | Specifies inward offsets from the top, right, bottom, and left edges of the mask image, dividing it into 9 regions | |
| mask-box-image-source | WD | Specifies an image to be used as mask | |
| mask-box-image-width | WD | Specifies offsets that are used to divide the mask box image area into 9 parts | |
| mask-clip | WD | Specifies the mask painting area, which determines the area that is affected by the mask | |
| mask-composite | nonstd | Sets a compositing style for a mask | webkit |
| mask-image | WD | Sets the mask image(s) of the element | |
| mask-origin | WD | Specifies the mask positioning area(s) | |
| mask-position | WD | Specifies the initial position of mask images within their corresponding mask painting area | |
| mask-position-x | nonstd | Specifies the x coordinate of the initial position of mask images | webkit |
| mask-position-y | nonstd | Specifies the y coordinate of the initial position of mask images | webkit |
| mask-repeat | WD | Specifies how mask images are tiled after they have been sized and positioned. | |
| mask-repeat-x | nonstd | ||
| mask-repeat-y | nonstd | ||
| mask-size | WD | Specifies the size of the mask images | |
| mask-type | WD | Specifies whether the content of the ‘mask’ is treated as as luminance mask or alpha mask | |
| :matches() | WD | Matches an element that matches at least one of the operand selectors | |
| match-nearest-mail-blockquote-color | nonstd | Webkit; characterized as “unsupported” | |
| :math-anonymous | nonstd | Firefox | |
| :math-columnline | nonstd | Firefox | |
| :math-firstcolumn | nonstd | Firefox | |
| :math-firstrow | nonstd | Firefox | |
| :math-font-size | nonstd | Firefox | |
| :math-font-style | nonstd | Firefox | |
| :math-lastcolumn | nonstd | Firefox | |
| :math-rowline | nonstd | Firefox | |
| :math-lastrow | nonstd | Firefox | |
| :math-stretchy | nonstd | Firefox | |
| max-color-index @? | REC | Tests the number of entries in the color lookup table for being less than or equal to a value | |
| max-color @? | REC | Tests the number of bits per color being less than or equal to a value | |
| max-device-aspect-ratio @? | REC | Tests the width/height ratio of the device for being less than or equal to a value | |
| max-device-height @? | REC | Tests height of device’s rendering surface for being less than or equal to a value | |
| max-device-pixel-ratio @? | nonstd | Test the number of CSS reference pixels per physical device pixel for being at most the given value | Cf. to device-pixel-ratio |
| max-device-width @? | REC | Tests width of device’s rendering surface for being less than or equal to a value | |
| max-height | CSS 2.1 | Sets a maximum height for the element | |
| max-height @? | REC | Tests height of display area for being less than or equal to a value | |
| max-logical-height | |||
| max-logical-width | |||
| max-monochrome @? | REC | Tests the number of bits per pixel in a monochrome frame buffer for being less than or equal to a value | |
| max-resolution @? | REC | Tests the pixel density for being less than or equal to a value | |
| max-width | CSS 2.1 | Sets a maximum width for the element | |
| max-width @? | REC | Tests width of display area for being less than or equal to a value | |
| max-zoom | WD | Sets the largest allowed zoom factor | |
| @media | CSS 2.1 | Specifies rules that depend on media | Extended in CSS3: http://www.w3.org/TR/css3-conditional/#at-media and http://www.w3.org/TR/css3-mediaqueries/ |
| min-aspect-ratio @? | REC | Tests the width/height ratio of the display area for being greater than or equal to a value | |
| min-color @? | REC | Tests the number of bits per color being greater than or equal to a value | |
| min-color-index @? | REC | Tests the number of entries in the color lookup table for being greater than or equal to a value | |
| min-device-aspect-ratio @? | REC | Tests the width/height ratio of the device for being greater than or equal to a value | |
| min-device-height @? | REC | Tests height of device’s rendering surface for being greater than or equal to a value | |
| min-device-pixel-ratio @? | nonstd | Test the number of CSS reference pixels per physical device pixel for being at least the given value | Cf. to device-pixel-ratio |
| min-device-width @? | REC | Tests width of device’s rendering surface for being greater than or equal to a value | |
| min-height | CSS 2.1 | Sets a minimum height for the element | |
| min-height @? | REC | Tests height of display area for being greater than or equal to a value | |
| mini-fold | nonstd | Opera | |
| min-logical-height | nonstd | ||
| min-logical-width | nonstd | ||
| minmax() | WD | Denotes the larger of its argument, when setting column width in display property value using template layout. | |
| min-monochrome @? | REC | Tests the number of bits per pixel in a monochrome frame buffer for being greater than or equal to a value | |
| min-resolution @? | REC | Tests the pixel density for being greater than or equal to a value | |
| min-width | CSS 2.1 | Sets a minimum width for the element | |
| min-width @? | REC | Tests width of display area for being greater than or equal to a value | |
| min-zoom | WD | Specifies the smallest allowed zoom factor | |
| mm | CSS 2.1 | Unit nominally corresponding to a millimeter | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| monochrome @? | REC | Tests the number of bits per pixel in a monochrome frame buffer for being equal to a value | |
| move-to | WD | Causes the element or pseudo-element to be removed from the flow and reinserted at a later point in the document | Outdated WD (2003) |
| -moz- | nonstd | Vendor prefix for Firefox and other browsers using Mozilla’s browser engine | |
| -ms- | nonstd | Vendor prefix for Internet Explorer | |
| ms | CR | Unit of time, millisecond (0.001 seconds) | |
| mso-* | nonstd | A large set of properties, with Microsoft-defined meanings | Generated and recognized by Microsoft Office software |
| @namespace | REC | Declares a namespace prefix and associates it with a given namespace name | |
| nav-banner-image | nonstd | Generated and recognized by Microsoft Office software | |
| nav-bottom | nonstd | ||
| navbutton-* | nonstd | Several properties related to navigation buttons | Generated by FrontPage |
| nav-down | nonstd | ||
| nav-down-shift | WD | Specifies a page shift effect when moving down | |
| @navigation | WD | Specifies which documents the user can navigate to by moving up, right, down, or left from the current document | |
| nav-index | WD | Specifies the position of the current element in the sequential navigation order (tabbing order) | |
| nav-left | nonstd | ||
| nav-left-shift | WD | Specifies a page shift effect when moving left | |
| nav-right | nonstd | ||
| nav-right-shift | WD | Specifies a page shift effect when moving right | |
| nav-up | nonstd | ||
| nav-up-shift | WD | Specifies a page shift effect when moving up | |
| nbsp-mode | nonstd | Specifies the behavior of no-break spaces | WebKit |
| negative | WD | Defines how to alter the representation when the counter value is negative | |
| none | CSS 2.1 | A common value of CSS properties, usually indicating lack of specific styling | |
| normal | CSS 2.1 | A common value of properties, indicating “standard” value | |
| :not() | REC | Matches an element that does not match the operand selector | |
| :nth-child() | REC | Matches an element that is the nth child | |
| :nth-column() | WD | Matches a cell in an nth column | |
| :nth-last-child() | REC | Matches an element that is the nth last child | |
| :nth-last-column() | WD | Matches a cell in an nth last column | |
| :nth-last-match() | WD | Matches the nth last of elements that match any of the selectors in the argument | |
| :nth-last-of-type() | REC | Matches an element that is the nth last child of its type | |
| :nth-match() | WD | Matches the nth of elements that match any of the selectors in the argument | |
| :nth-of-type() | REC | Matches an element that is the nth child of its type | |
| <number> | CSS 2.1 | Metanotation for data type representing a number (which may have a fractional part) | |
| -o- | nonstd | Vendor prefix for Opera | Opera also recognizes the -webkit- prefix now |
| object-fit | CR | Specifies how the contents of the (replaced) element is fitted to the box established by its used height and width | Opera, see http://dev.opera.com/articles/view/css3-object-fit-object-position/ |
| object-position | CR | Specifies the alignment of the (replaced) element inside its box | Opera, see http://dev.opera.com/articles/view/css3-object-fit-object-position/ |
| oeb-column-number | nonstd | Specifies the number of columns in which to render content | In OPS (for EPUB) |
| oeb-page-foot | nonstd | Value of display property, indicating that the element should be rendered in a page footer area of a reading program | In OPS (for EPUB) |
| oeb-page-head | nonstd | Value of display property, indicating that the element should be rendered in a page header area of a reading program | In OPS (for EPUB) |
| :only-child | REC | Matches an element that is the only child of its parent | |
| :only-of-type | REC | Matches an element that is the only element of its type among the children of its parent | |
| opacity | REC | Specifies the opacity (non-transparency) of the element | |
| :optional | WD | Matches a form field that has not been declared as required | |
| order | CR | Specifies the order used to lay out flex items in their flex container | |
| orient | nonstd | Specifies the orientation of the element as horizontal or vertical | |
| orientation | WD | Selects portrait or landscape mode | |
| orientation @? | REC | Tests the orientation of the device (portrait or landscape) | |
| orphans | CSS 2.1 | Sets the minimum number of lines in a block that must be left at the bottom of a printed page | |
| outline | CSS 2.1 | Shorthand for outline color, style, and width | |
| outline-color | CSS 2.1 | Sets the color of the outline around the element | |
| outline-offset | CSS 2.1 | Sets the distance between the outline and the edge or border | |
| outline-radius | nonstd | A shortcut for setting curved corners for an outline | |
| outline-radius-bottomleft | nonstd | Sets the rounding of the bottom-left corner of the outline | |
| outline-radius-bottomright | nonstd | Sets the rounding of the bottom-right corner of the outline | |
| outline-radius-topleft | nonstd | Sets the rounding of the top-left corner of the outline | |
| outline-radius-topright | nonstd | Sets the rounding of the top-right corner of the outline | |
| outline-style | CSS 2.1 | Sets the line style of the outline around the element | |
| outline-width | CSS 2.1 | Sets the line width of the outline around the element | |
| :out-of-range | WD | Matches an element that does not satisfy range constraints imposed on it | |
| ::outside | WD | Matches a pseudo-element immediately outside the given element | Outdated WD (2003) |
| overflow | CSS 2.1 | Specifies what happens on content overflow | |
| overflow-scrolling | nonstd | webkit | |
| overflow-style | CR | Specifies the preferred scrolling method (horizontal or vertical marquee) for elements that overflow | Defined partly differently in a WD being rewritten: http://www.w3.org/TR/css3-box/#overflow-style ; see also http://msdn.microsoft.com/en-US/library/ie/ms530782.aspx |
| overflow-wrap | WD | Specifies whether line breaks are allowed anywhere in order to prevent overflow caused by an otherwise unbreakable string | |
| overflow-x | WD | Specifies what happens horizontally on content overflow | |
| overflow-y | WD | Specifies what happens vertically on content overflow | |
| padding | CSS 2.1 | Shorthand for padding properties | |
| padding-after | nonstd | ||
| padding-before | nonstd | ||
| padding-bottom | CSS 2.1 | Specifies amount of padding below the content | |
| padding-end | nonstd | Adds horizontal padding at the end i.e. right or left padding, depending on declared writing direction | WebKit, Firefox |
| padding-left | CSS 2.1 | Specifies amount of padding to the left of the content | |
| padding-right | CSS 2.1 | Specifies amount of padding to the right of the content | |
| padding-start | nonstd | Adds horizontal padding at the start, i.e. left or right padding, depending on declared writing direction | WebKit, Firefox |
| padding-top | CSS 2.1 | Specifies amount of padding above the content | |
| page | WD | Refers to a @page rule by identifier | |
| ::page | nonstd | Matches an individual page in paged rendering | |
| ::page() | WD | Matches the part of an element that ends up on a certain page of the element | |
| @page | CSS 2.1 | Defines a rule for printed pages | |
| ::pagebreak | nonstd | Firefox | |
| page-break-after | CSS 2.1 | Sets conditions for page breaks after the element | |
| page-break-before | CSS 2.1 | Sets conditions for page breaks before the element | |
| page-break-inside | CSS 2.1 | Sets conditions for page breaks inside the element | |
| ::page-column() | WD | Matches the part of an element that ends up on a certain column of a certain page of the element | |
| ::pagecontent | nonstd | Firefox | |
| page-policy | WD | Determines which page-based occurance of a given element is applied to a counter or string value | Outdated WD (2003) |
| ::page-sequence | nonstd | Represents the background of the print preview | |
| panose-1 | nonstd | Generated and recognized by Microsoft Office software | |
| :past | WD | Matches an element that is defined to be rendered entirely prior to the :current element | |
| pause | CR | Shorthand for pause-after and pause-before | http://www.w3.org/TR/CSS2/aural.html#propdef-pause |
| pause-after | CR | Specifies the duration of pause after the element | http://www.w3.org/TR/CSS2/aural.html#propdef-pause-after |
| pause-before | CR | Specifies the duration of pause before the element | http://www.w3.org/TR/CSS2/aural.html#pause-props |
| pc | CSS 2.1 | Unit nominally corresponding to a pica, 12 points | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| pending() | WD | As display property value, causes all elements and pseudo-elements whose 'move-to' property computes to the specified identifier to be inserted as children of the current element (or pseudo-element) | Outdated WD (2003) |
| <percentage> | CSS 2.1 | Metanotation for data type representing a percentage | |
| perspective | WD | Specifies the distance between the z = 0 plane and the user | |
| perspective() | WD | A transform function that specifies a perspective projection matrix | |
| perspective-origin | WD | Specifies the position that the viewer is looking at | |
| perspective-origin-x | nonstd | Specifies the x coordinate of the position that the viewer is looking at | |
| perspective-origin-y | nonstd | Specifies the y coordinate of the position that the viewer is looking at | |
| phonemes | nonstd | With -xv- prefix. | |
| pitch | withdr. | Specifies the average pitch (a frequency) of the speaking voice | |
| pitch-range | withdr. | Specifies the variation in pitch of voice | |
| :placeholder | nonstd | Matches a form field in the state of displaying placeholder text | Firefox, with -moz- prefix; Firefox 19 will switch to using a pseudo-element |
| play-during | withdr. | Specifies a sound to be played as a background while the element’s content is spoken | |
| pointer-events | SVG 1.1 | Specifies the circumstances under which the element can become the target of mouse events | The use of pointer-events in CSS for non-SVG elements is experimental. The feature used to be part of the CSS3 UI draft specification but, due to many open issues, has been postponed to CSS4. |
| position | CSS 2.1 | Specifies the positioning principle (static, relative...) for the element | |
| <position> | CSS 2.1 | Metanotation for data type representing a point in a 2D space | |
| prefix | WD | Specifies a string that is prepended to the marker representation | |
| presentation-level | WD | Sets the element’s presentation level (EPL) | WD from 2003, flagged as inactive |
| -prince- | nonstd | Vendor prefix for YesLogic | |
| print-color-adjust | nonstd | Chrome | |
| progress-appearance | nonstd | Specifies whether progress control appears as bar or ring | IE, declared obsolete in favor of animation-name |
| pt | CSS 2.1 | Unit nominally corresponding to a typographic point, 1/72 of an inch | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| punctuation-trim | nonstd | Specifies conditions for trimming spaces adjacent to fullwidth punctuation marks | Generated and recognized by Microsoft Office software |
| punctuation-wrap | nonstd | Specifies conditions for allowing punctuation marks are allowed in margin area | Generated and recognized by Microsoft Office software |
| px | CSS 2.1 | Unit nominally corresponding to a pixel | Actual size depends on the reference unit, see http://www.w3.org/TR/css3-values/#absolute-lengths |
| quotes | CSS 2.1 | Specifies quotation marks to appear around the element | |
| rad | CR | Unit of angle, radian (1/2? of a circle) | |
| radial-gradient | CSS 2.1 | Creates an image that represents a radial gradient of colors | |
| range | WD | Defines the ranges over which the counter style is defined | |
| <ratio> | REC | Metanotation for data type representing a proportion of two unitless values | |
| :read-only | WD | Matches an element that is not editable by the user | |
| :read-write | WD | Matches an element that is editable by the user | |
| rect() | CSS 2.1 | Defines a rectangular region | |
| @region | WD | Contains style declarations specific to particular regions | |
| region-break-after | nonstd | Chrome | |
| region-break-before | nonstd | Chrome | |
| region-break-inside | nonstd | Chrome | |
| region-overflow | WD | Controls the behavior of the last region associated with a named flow | |
| rem | CR | Unit, root em, the font size of the root element | |
| rendering-intent | withdr. | Specifies the color profile rendering intent, as per the ICC Profile Format Specification | Dropped from CSS3 Colors in the REC, see http://www.w3.org/TR/css3-color/#dropped |
| ::repeat-index | WD | The current item of a repeating sequence, as a pseudo-element | |
| repeating-linear-gradient() | CR | Creates an image that represents a repeating linear gradient of colors | |
| repeating-radial-gradient() | CR | Creates an image that represents a repeating radial gradient of colors | |
| ::repeat-item | WD | A single item of a repeating sequence, as a pseudo-element | |
| replace | obsol. | Indicates the element as replaced, with replacement specified as generated content | Opera; now discontinued: http://www.opera.com/docs/specs/opera9/#xml-css-link |
| :required | WD | Matches a form field that has been designated as required | |
| resize | WD | Sets the resizability of the element | |
| resolution | WD | Relates the CSS pixel to the reference pixel or the physical length units | |
| resolution @? | REC | Tests the pixel density for being equal to a value | |
| <resolution> | REC | Metanotation for data type representing the density of pixels on a device | |
| rest | CR | Shorthand for rest-before and rest-after | |
| rest-after | CR | Specifies a pause after the element but before any cue-after content | |
| rest-before | CR | Specifies a pause before the element but after any cue-after content | |
| ::reveal | nonstd | Matches the password reveal button of an input type=password control | IE |
| rgb() | CSS 2.1 | Denotes a color by its red, green, and blue component | |
| rgba() | CSS 2.1 | Denotes a color in the red–green–blue–alpha model | |
| richness | withdr. | Specifies the richness, or brightness, of the speaking voice | |
| right | CSS 2.1 | Sets right displacement for a positioned element | |
| :right | CSS 2.1 | Matches a right-side page in print media (@page environment) | |
| -rim- | nonstd | Vendor prefix for Research In Motion | |
| -ro- | nonstd | Vendor prefix for Real Objects | |
| :root | REC | Matches the root element (in HTML, the element) | |
| rotate() | WD | Defines a transformation that moves the element around a fixed point | http://www.w3.org/TR/css3-transforms/ |
| rotateX() | WD | Defines a transformation that moves the element around x-axis | |
| rotateY() | WD | Defines a transformation that moves the element around y-axis | |
| rotate3D() | WD | ||
| rotateZ() | WD | Defines a transformation that moves the element around z-axis | |
| rotate3d() | WD | Defines a 3D transformation that moves the element around a fixed axis of rotation | |
| rotation | WD | Rotates a block-level element counterclockwise around the point given by ‘rotation-point’ | WD flagged as being rewritten |
| rotation-point | WD | Defines, for rotation, a point as an offset from the top left border edge. | WD flagged as being rewritten |
| row-span | nonstd | Generated and recognized by Microsoft Office software | |
| rounddown() | ed. | Yields the largest multiple of the specified unit that is equal to or less than the given value | |
| roundup() | ed. | Yields the smallest multiple of the specified unit that is equal to or greater than the given value | |
| rtl-ordering | nonstd | Overrides ordering defaults for right-to-left content as “logical” or “visual” | webkit |
| ruby-align | WD | Aligns ruby text and ruby base content relative to each other | Generated and recognized by Microsoft Office software, see http://msdn.microsoft.com/en-us/library/Aa155477 |
| ruby-overhang | WD | Specifies whether, and on which side, ruby text is allowed to partially overhang adjacent text in addition to its own base, when the ruby text is wider than the ruby base | Generated and recognized by Microsoft Office software, see http://msdn.microsoft.com/en-us/library/Aa155477 |
| ruby-position | WD | Sets the position of ruby text with respect to its base | Generated and recognized by Microsoft Office software, see http://msdn.microsoft.com/en-us/library/Aa155477 |
| ruby-span | WD | Controls the spanning behavior of ruby annotation elements | |
| running() | WD | As the value of the position property, makes the element a running element that is not displayed in its natural place but may be displayed in a margin box | |
| scale() | WD | Scales the element horizontally, vertically, or both | http://www.w3.org/TR/css3-transforms/ |
| scaleX() | WD | Scales the element in the x direction | |
| scaleY() | WD | Scales the element in the y direction | |
| scaleZ() | WD | Scales the element in the z direction | |
| scale3d(X) | WD | Scales the element in the x and/or y and/or z direction | |
| scan @? | REC | Tests the scanning process of tv output devices (progressive or interlace) | |
| ::selection | withdr. | Matches the part of the document that has been selected by the user | Widely supported |
| separator-image | nonstd | Generated by FrontPage | |
| set-link-source | obsol. | Sets the value of a variable that can be used to create a link with link-source | Opera; now the name used is “link” |
| <shape> | CSS 2.1 | Metanotation for data type representing the specific form of a region; currently only rect() is possible | |
| shape-inside | nonstd | Chrome | |
| shape-margin | nonstd | Chrome | |
| shape-outside | nonstd | Chrome | |
| shape-padding | nonstd | Chrome | |
| :scope | WD | Matches an element that is in the contextual reference element set | |
| script-level | nonstd | Only for browser stylesheets, Firefox | |
| script-min-size | nonstd | Only for browser stylesheets, Firefox | |
| script-size-multiplier | nonstd | Only for browser stylesheets, Firefox | |
| scrollbar-3dlight-color property | nonstd | Sets the color of the top and left edges of the scroll box and scroll arrows of a scroll bar | IE |
| scrollbar-arrow-color | nonstd | Sets the color of a scroll arrow | IE |
| scrollbar-base-color | nonstd | Sets the color of the main elements of a scroll bar, which include the scroll box, track, and scroll arrows | IE |
| scrollbar-darkshadow-color | nonstd | Sets the color of the gutter of a scroll bar | IE |
| scrollbar-end-backward @? | nonstd | Tests whether the device’s user interface displays a backward arrow button at the end of scrollbars | |
| scrollbar-end-forward @? | nonstd | Tests whether the device’s user interface displays a forward arrow button at the end of scrollbars | |
| scrollbar-face-color | nonstd | Sets the color of the scroll box and scroll arrows of a scroll bar | IE |
| scrollbar-highlight-color | nonstd | Sets the color of the top and left edges of the scroll box and scroll arrows of a scroll bar | IE |
| scrollbar-shadow-color | nonstd | Sets the color of the bottom and right edges of the scroll box and scroll arrows of a scroll bar | IE |
| scrollbar-start-backward @? | nonstd | Tests whether the device’s user interface displays a backward arrow button at the beginning of scrollbars | |
| scrollbar-start-forward @? | nonstd | Tests whether the device’s user interface displays a forward arrow button at the beginning of scrollbars | |
| scrollbar-thumb-proportional @? | nonstd | Tests whether the device’s user interface displays the thumb of scrollbars proportionally (that is, sized based on the percentage of the document that is visible) | |
| scrollbar-track-color | nonstd | Sets the color of the track element of a scroll bar | IE |
| scroll-chaining | nonstd | Specifies the scrolling behavior that occurs when a user hits the scroll limit during a manipulation | IE |
| scroll-limit | nonstd | Shorthand for scroll-limit-x-min, scroll-limit-y-min, scroll-limit-x-max, and scroll-limit-y-max | IE |
| scroll-limit-x-max | nonstd | Specifies the maximum value for the scrollLeft property | IE |
| scroll-limit-x-min | nonstd | Specifies the minimum value for the scrollLeft property. | IE |
| scroll-limit-y-max | nonstd | Specifies the maximum value for the scrollTop property | IE |
| scroll-limit-y-min | nonstd | Specifies the minimum value for the scrollTop property | IE |
| scroll-rails | nonstd | Specifies whether scrolling locks to the primary axis of motion | IE |
| scroll-snap-points-x | nonstd | Defines where snap-points will be located along the x-axis | IE |
| scroll-snap-points-y | nonstd | Defines where snap-points will be located along the y-axis | IE |
| scroll-snap-type | nonstd | Specifies what type of snap-point should be used for the current element | IE |
| scroll-snap-x | nonstd | Shortcut for scroll-snap-type and scroll-snap-points-x properties | IE |
| scroll-snap-y | nonstd | Shortcut for scroll-snap-type and scroll-snap-points-y properties | IE |
| scroll-translation | nonstd | Specifies whether vertical-to-horizontal scroll wheel translation occurs on the specified element | IE |
| ::scrolled-canvas | nonstd | Firefox | |
| ::scrolled-content | nonstd | Firefox | |
| ::scrolled-page-sequence | nonstd | Represents the background of the print preview | Obscure; cf. ::page-sequence |
| ::selection | withdr. | Matches the portion of the document that has been highlighted (e.g., selected with the mouse or another pointing device) by the user | See also http://msdn.microsoft.com/en-us/library/windows/apps/hh996968.aspx |
| shape-image-threshold | WD | Defines the alpha channel threshold used to extract the shape using an image | |
| shape-inside | WD | Modifies the shape of the inner inline flow content from rectangular content box to an arbitrary geometry | |
| shape-margin | nonstd | ||
| shape-outside | WD | Changes the geometry of an exclusion element’s exclusion area or or a float element’s float area | |
| shape-padding | nonstd | ||
| shape-rendering | nonstd | Chrome, without prefix | |
| size | WD | Specifies the size and orientation of the containing box for page content | |
| skew() | WD | Skews the element in the x and/or y direction | |
| skewX() | WD | Skews the element in the x direction | |
| skewY() | WD | Skews the element in the y direction | |
| skewZ() | WD | Skews the element in the z direction | |
| skew3D(X) | WD | Skews the element in the x and/or y and/or z direction | |
| ::slot() | WD | Matches | |
| speak | CR | Specifies whethet content is spoken and whether it is to be spelled out | http://www.w3.org/TR/CSS2/aural.html#speaking-props |
| speak-as | CR | Specifies in what manner text is spoken in speech synthesis, based upon a predefined list of possibilities | |
| speak-header | withdr. | Specifies how table headers are spoken | |
| speak-numeral | withdr. | Specifies how numerals are spoken | |
| speak-punctuation | withdr. | Specifies how punctuation is spoken | |
| speech-rate | withdr. | Specifies the speaking rate | |
| src | WD | Specifies the resource containing font data | |
| stack-sizing | nonstd | Sets the resizing principle of XUL stack | |
| steps() | WD | Defines a step function dividing the domain of output values in equidistant steps | |
| stop-color | nonstd | Chrome, without prefix | |
| stop-opacity | nonstd | Chrome, without prefix | |
| stress | withdr. | Specifies the height of “local peaks” in the intonation contour of a voice | |
| @string | WD | Specifies a block of string definitions (?) | Outdated WD (2003), “syntax still to come” |
| string() | WD | Yields the value of a named string | |
| <string> | CSS 2.1 | Metanotation for data type representing a string of characters delimited by quotes | |
| string-set | WD | Defines a named string | Also sketchily in outdated WD http://www.w3.org/TR/css3-content/#strings |
| stroke | nonstd | Chrome, without prefix | |
| stroke-dasharray | nonstd | Chrome, without prefix | |
| stroke-dashoffset | nonstd | Chrome, without prefix | |
| stroke-linecap | nonstd | Chrome, without prefix | |
| stroke-linejoin | nonstd | Chrome, without prefix | |
| stroke-miterlimit | nonstd | Chrome, without prefix | |
| stroke-opacity | nonstd | Chrome, without prefix | |
| stroke-width | nonstd | Chrome, without prefix | |
| :submit-invalid | nonstd | Matches a submit button in a form whose contents aren’t valid based on their validation constraints | |
| suffix | WD | Specifies a string that is appended to the marker representation | |
| @supports | WD | Specifies rules to be applied conditionally, depending on support to given constructs in the browser | |
| :suppressed | nonstd | Matches elements representing images that were not loaded because loading images from that site has been blocked | |
| ::svg-foreign-content | nonstd | Firefox | |
| svg-shadow | nonstd | Chrome | |
| symbols | WD | Specifies the symbols used by the marker-construction algorithm specified by the ‘system’ descriptor | |
| symbols() | WD | Specifies a counter style as a property value | |
| system | WD | Specifies which algorithm will be used to construct the counter’s representation | |
| :system-metric() | nonstd | Matches an element if the computer's user interface supports the feature specified as argument | Mainly for theme developers |
| ::table | nonstd | Firefox | |
| table-baseline | nonstd | (Relates to MathML tables) | Opera |
| table-border-color-dark | nonstd | Generated by FrontPage | |
| table-border-color-light | nonstd | Generated by FrontPage | |
| ::table-cell | nonstd | Firefox | |
| ::table-column | nonstd | Firefox | |
| ::table-column-group | nonstd | Firefox | |
| ::table-cell | nonstd | Firefox | |
| table-layout | CSS 2.1 | Specifies whether table layout is automatic or fixed | |
| ::table-outer | nonstd | Firefox | |
| ::table-row | nonstd | Firefox | |
| ::table-row-group | nonstd | Firefox | |
| tab-size | WD | Specifies the distance of tab stops | |
| tab-stops | nonstd | Generated and recognized by Microsoft Office software | |
| tap-highlight-color | nonstd | Overrides the highlight color shown when the user taps a link or a JavaScript clickable element in Safari on iPhone | webkit |
| target | withdr. | Shorthand for setting the individual target properties | |
| :target | REC | Matches an element that is the target of the URL of the document | |
| target-counter() | WD | Yields the value of a counter at the target end of the link | |
| target-counters() | WD | Yields a value composed of values of counters at the end of the link | |
| target-name | withdr. | Defines the name of the target destination of a link | |
| target-new | withdr. | Determines whether a new window or tab is created as a target destination | |
| target-position | withdr. | Indicates whether a new target destination (if created) is placed above, behind, front, or back the current window or tab | |
| target-pull() | WD | Yields the value of an attribute of the target of the link that the current element creates | Not really defined in the WD |
| target-text() | WD | Yields the textual content from the target end of the link | |
| -tc- | nonstd | Vendor prefix for Tall Components | |
| text-anchor | nonstd | Chrome, without prefix | |
| text-align | CSS 2.1 | Specifies the alignment of text lines inside the element | |
| text-align-last | WD | Specifies the alignment of the last text line in the element | |
| text-autospace | withdr. | Sets the autospacing and narrow space width adjustment of text | Generated and recognized by Microsoft Office software; see http://msdn.microsoft.com/en-US/library/ie/ms531164.aspx |
| text-blink | nonstd | Specifies whether the text blinks or not | |
| text-combine | nonstd | Generated and recognized by Microsoft Office software. With -epub- prefix in ePub software. Also in Chrome. | |
| text-combine-horizontal | WD | Allows the combination of multiple characters into the space of a single character | |
| text-decoration | CSS 2.1 | Specifies underline, overline, line through, or blinking for text | CSS Text Decoration Level 3 defines this property as a shorthand for the three new text-decoration-color, text-decoration-line, and text-decoration-style |
| text-decoration-color | WD | Sets the color of underline, overline, or line through | |
| text-decoration-line | WD | Specifies whether underline, overline, line through, or blinking is applied to the text | |
| text-decorations-in-effect | nonstd | Webkit; characterized as “unsupported” | |
| text-decoration-skip | ed. | Specifies what parts of the element’s content any text decoration affecting the element must skip over | |
| text-decoration-style | WD | Sets the style of lines used for underline, overline, or line through | |
| text-effect | nonstd | Generated and recognized by Microsoft Office software | |
| text-emphasis | WD | Shorthand for text-emphasis properties | Implemented in ePub with prefix. See also http://dev.w3.org/csswg/css4-text/#text-emphasis |
| text-emphasis-color | WD | Specifies the color of emphasis marks | Implemented in ePub with prefix. See also http://dev.w3.org/csswg/css4-text/#text-emphasis-color |
| text-emphasis-position | WD | Specifies where emphasis marks are drawn at | http://dev.w3.org/csswg/css4-text/#text-emphasis-position |
| text-emphasis-skip | ed. | Specifies which characters are skipped when drawing emphasis marks | |
| text-emphasis-style | ed. | Applies emphasis marks to the element's text | ePub |
| text-fill-color | nonstd | Specifies a fill color for text | WebKit. It has the same effect as the color property, but it allows graceful degradation in some cases. |
| text-fit | nonstd | Generated and recognized by Microsoft Office software | |
| text-height | WD | Determines the block-progression dimension of the text content area of an inline box | No implementations; WD (2002) effectively abandonded |
| text-indent | CSS 2.1 | Indents the first line of the element | |
| text-justify | WD | Sets the method of justification of text lines | See also http://msdn.microsoft.com/en-US/library/ie/ms531172.aspx . Also proposed in http://dev.w3.org/csswg/css4-text/#text-justify |
| text-justify-trim | nonstd | Specifies conditions for trimming spaces in justification | Generated and recognized by Microsoft Office software |
| text-kashida | nonstd | Generated and recognized by Microsoft Office software | |
| text-kashida-space | nonstd | Sets the ratio of kashida expansion to white space expansion when justifying lines of text in the object | IE; deprecated |
| text-line-through | nonstd | Generated and recognized by Microsoft Office software | |
| text-orientation | WD | Specifies the orientation of characters within a line | ePub |
| text-outline | withdr. | Sets a text outline of specific thickness, color, and blur radius | Was removed in 1 September 2011 version. Cf. to text-stroke |
| text-overflow | WD | Specifies how truncation of text (due to overflow) is indicated | |
| text-rendering | SVG 1.1 | Sets criteria on selecting text rendering methods | Works for HTML elements too, in WebKit browsers |
| text-security | nonstd | Specifies the shape to use in place of letters in a password input field | webkit |
| text-shadow | WD | Adds shadows to text | |
| text-size-adjust | ed. | Specifies how text size is adjusted in a small device | webkit, in Safari on iPhone; see http://css-infos.net/property/-webkit-text-size-adjust |
| text-space-collapse | ed. | Specifies whether and how white space inside the element is collapsed | |
| text-spacing | ed. | Controls spacing between adjacent characters on the same line, within the same inline formatting context, using a set of character-class-based rules | |
| text-stroke | nonstd | Specifies the width and color of the outline (stroke) of text | WebKit |
| text-stroke-color | nonstd | Specifies the color of the outline (stroke) of text | WebKit |
| text-stroke-width | nonstd | Specifies the width of the outline (stroke) of text | WebKit |
| text-transform | CSS 2.1 | Converts characters to lowercase, to uppercase, to fullwidth, or to fullsize kana | |
| text-trim | withdr. | Specifies whether a fullwidth punctuation character should be trimmed (kerned) | |
| text-underline | nonstd | Generated and recognized by Microsoft Office software | |
| text-underline-color | nonstd | Generated and recognized by Microsoft Office software | |
| text-underline-position | WD | Sets the position of an underline specified on the same element, as alphabetic, under, left, or right | Generated and recognized by Microsoft Office software, in a very limited manner; http://msdn.microsoft.com/en-us/library/Aa155477 ; see also http://msdn.microsoft.com/en-US/library/ie/ms531176.aspx |
| text-underline-style | nonstd | Generated and recognized by Microsoft Office software | |
| text-wrap | ed. | Specifies the mode for text wrapping (normal, none, avoid) | |
| ::thumb | nonstd | Matches the portion of an input type=range control (slider control) that the user drags | IE |
| ::ticks-after | nonstd | Matches the tick marks after the slider track of an input type=range control (slider control) | IE |
| ::ticks-before | nonstd | Matches the tick marks before the slider track of an input type=range control (slider control) | IE |
| <timing-function> | WD | Denotes a mathematical function that describes how fast one-dimensional values change during transitions or animations | |
| toggle() | CR | An expression that cycles over a list of values for nested elements | |
| ::tooltip | nonstd | Matches the tooltip of a slider (input type=range) | IE |
| top | CSS 2.1 | Sets top displacement for a positioned element | |
| top-bar-button | nonstd | Generated by FrontPage | |
| touch-action | nonstd | Specifies how the element can be affected by touch gestures | IE |
| touch-callout | nonstd | Specifies whether the default callout is shown when you touch and hold a touch target | Only in mobile builds of WebKit |
| touch-enabled @? | nonstd | Tests whether device supports touch events (for a touch screen) | |
| ::track | nonstd | Matches the track of an input type=range control (slider control) | IE |
| transform | WD | Modifies the coordinate space of the CSS visual formatting model | |
| transform-origin | WD | Sets the origin for transformations of the element | |
| transform-origin-x | nonstd | Sets the x coordinate of the origin for transformations of the element | webkit |
| transform-origin-y | nonstd | Sets the y coordinate of the origin for transformations of the element | webkit |
| transform-origin-z | nonstd | Sets the z coordinate of the origin for transformations of the element | webkit |
| transform-style | WD | Specifies whether the children of the element are positioned in the 3D space or are flattened in the plane of the element | |
| transition | WD | Shorthand for transition properties | |
| transition-delay | WD | Specifies the delay before starting a transition | |
| transition-duration | WD | Specifies the duration of a cycle in transition | |
| transition-property | WD | Specifies the properties that are affected by a transition | |
| transition-repeat-count | nonstd | Webkit; characterized as “unsupported” | |
| transition-timing-function | WD | Specifies the timing function of a transition | |
| translate() | WD | Moves the element in x and/or y direction | |
| translateX() | WD | Moves the element in x direction | |
| translateY() | WD | Moves the element in y direction | |
| translateZ() | WD | Moves the element in z direction | |
| translate3d() | WD | Moves the element in x, y, or z direction | |
| :tree-checkbox | nonstd | Firefox; relates to XUL | |
| :tree-cell | nonstd | Firefox; relates to XUL | |
| :tree-cell-text | nonstd | Firefox; relates to XUL | |
| :tree-cell-text(hover) | nonstd | Firefox; relates to XUL | |
| :tree-column | nonstd | Firefox; relates to XUL | |
| :tree-drop-feedback | nonstd | Firefox; relates to XUL | |
| :tree-image | nonstd | Firefox; relates to XUL | |
| :tree-indentation | nonstd | Firefox; relates to XUL | |
| :tree-line | nonstd | Firefox; relates to XUL | |
| :tree-progressmeter | nonstd | Firefox; relates to XUL | |
| :tree-row | nonstd | Firefox; relates to XUL | |
| :tree-row(hover) | nonstd | Firefox; relates to XUL | |
| :tree-separator | nonstd | Firefox; relates to XUL | |
| :tree-twisty | nonstd | Firefox; relates to XUL | |
| turn | CR | Unit of angle, a turn, i.e. full circle (360 degrees) | |
| :ui-invalid | nonstd | Matches a validated form element whose value isn’t valid based on validation constraint | |
| :ui-valid | nonstd | Matches a validated form element whose value is valid based on validation constraint | |
| unicode-bidi | CSS 2.1 | Specifies how to content is to be handled with respect to Unicode bidirectional algorithm | |
| unicode-range | WD | Specifies the collection of characters for which the font is to be used | |
| <uri> | CSS 2.1 | Data type corresponding to a URI (URL or URN) | |
| url() | CSS 2.1 | A URI (URL or URN) | |
| use-link-source | obsol. | Turns the element to a link (“source anchor”) | Opera; now the name “link-source” is used for the property |
| user-drag | nonstd | Specifies whether the entire element should be draggable instead of its contents | webkit |
| :user-error | WD | Matches an input element with incorrect input, after the user has significantly interacted with it | |
| user-focus | nonstd | Indicates whether the element can have the focus via user action | Was proposed in https://developer.mozilla.org/en-US/docs/CSS/-moz-user-focus |
| <user-ident> | CSS 2.1 | Denotes an arbitrary user-defined string used as an identifier | |
| user-input | nonstd | Specifies whether the element will accept user input | |
| user-modify | nonstd | Determines whether a user can edit the content of the element and whether rich text formatting of pasted text is retained | webkit; also Firefox: https://developer.mozilla.org/en-US/docs/CSS/-moz-user-modify |
| user-select | withdr. | Specifies whether the content is selectable by the user | Was proposed in http://www.w3.org/TR/2000/WD-css3-userint-20000216#user-select |
| user-zoom | WD | Specifies whether the user can change the zoom factor | |
| :valid | WD | Matches a form field or form that satisfies validity constraints | |
| ::value | WD | The current value of a form field as a pseudo-element | In IE, the content of a text or password input control, or a select control: http://msdn.microsoft.com/en-us/library/windows/apps/hh465820.aspx |
| var() | WD | Yields the value of a variable | |
| var-* | WD | Defines a variable (e.g., var-foo defines foo) | |
| vector-effect | nonstd | Chrome, without prefix | |
| vertical-align | CSS 2.1 | Sets the vertical alignment of the content | |
| version | nonstd | Generated by FrontPage | |
| vh | CR | Unit equal to 1% of the height of the initial containing block | |
| @viewport | nonstd | Specifies properties that describe the viewport | IE |
| :viewport | nonstd | Firefox | |
| @viewport | WD | Overrides the viewport size provided by the browser | |
| :viewport-scroll | nonstd | Firefox | |
| visibility | CSS 2.1 | Sets the visibility to visible, hidden, or collapse | |
| :visited | CSS 2.1 | Matches a link that has been visited recently | |
| vmax | CR | Unit equal to the larger of ‘vw’ or ‘vh’ | |
| vmin | CR | Unit equal to the smaller of ‘vw’ or ‘vh’ | |
| voice-balance | CR | Controls the left/right balance of audio in speech synthesis | With -xv- prefix. |
| voice-duration | CR | Specifies how long it should take to render the content in synthetic speech | With -xv- prefix. |
| voice-family | CR | Specifies the characteristics of voice, e.g. male vs. female | http://www.w3.org/TR/CSS2/aural.html#propdef-voice-family |
| voice-pitch | CR | Specifies the pitch (frequency of sound) of synthetic speech | With -xv- prefix. |
| voice-pitch-range | nonstd | Probably the same as voice-range | With -xv- prefix. |
| voice-range | CR | Specifies the variation in pitch of synthetic speech | |
| voice-rate | CR | Specifies the rate (speed) of synthetic speech | With -xv- prefix. |
| voice-stress | CR | Specifies the strength of emphasis in synthetic speech | With -xv- prefix. |
| voice-volume | CR | Sets the voice volume in speech synthesis and audio cues | With -xv- prefix. |
| volume | withdr. | Specifies the volume of voice | |
| vw | CR | Unit equal to 1% of the width of the initial containing block | |
| -wap- | nonstd | Vendor prefix for WAP Forum | |
| -webkit- | nonstd | Vendor prefix for Chrome, Safari, and other browsers using the WebKit engine | Opera also recognizes the -webkit- prefix now |
| white-space | CSS 2.1 | Specifies how whitespace is handled and whether line breaks are allowed | |
| widows | CSS 2.1 | Sets the minimum number of lines in a block that must be left at the top of a printed page | |
| width | CSS 2.1 | Sets the width of the content area of an element | |
| width @? | REC | Tests width of display area for equality to a value | |
| :window-inactive | nonstd | Matches any element while it’s in an inactive window. | |
| windows-classic @? | nonstd | Tests whether the user is using Windows unthemed (in classic mode instead of using uxtheme) | |
| windows-compositor @? | nonstd | Tests whether the user is using Windows with the DWM compositor | |
| windows-default-theme @? | nonstd | Tests whether the user is using one of the default Windows themes (Luna, Royale, Zune, or Aero (including Vista Basic, Vista Advanced, and Aero Glass) | |
| window-shadow | nonstd | Specifies whether a window will have a shadow | |
| windows-theme @? | nonstd | Tests whether the user is using the Windows theme given as argument | |
| word-break | WD | Specifies whether line breaks are allowed between any characters | |
| word-spacing | CSS 2.1 | Specifies additional spacing between “words” (strings separated by whitespace) | |
| word-wrap | WD | Alternate name for overflow-wrap | |
| wrap | WD | Shorthand for setting the exclusions properties | |
| wrap-flow | WD | Makes the element an exclusion when the value is other than auto | See also http://msdn.microsoft.com/en-US/library/ie/hh772045.aspx |
| wrap-margin | WD | Offsets the inline flow content wrapping on the outside of exclusions | See also http://msdn.microsoft.com/en-US/library/ie/hh772042.aspx |
| wrap-padding | WD | Offsets the inline flow content wrapping on the inside of elements | |
| wrap-through | WD | Specifies whether the element inherits its parent node’s wrapping context | See also http://msdn.microsoft.com/en-US/library/ie/hh771900.aspx |
| writing-mode | WD | Specifies whether lines of text are laid out horizontally or vertically and the direction in which blocks progress | |
| ::xul-anonymous-block | nonstd | Firefox | |
| -xv- | nonstd | Vendor prefix for Opera Software (voice) | |
| z-index | CSS 2.1 | Specifies the placement on the z axis, for use when elements overlap | |
| zoom | WD | Specifies a zoom factor for the content | http://msdn.microsoft.com/en-us/library/ie/ms531189%28v=vs.85%29.aspx |
This document summarizes different CSS keywords:
The character * is used as a wildcard, so e.g.
For uniformity and searchability,
the names primarily appear without vendor prefixes
such as
The information has been collected from various sources, and it is not authoritative or complete. Some sources have intentionally been ignored here, such as old CSS drafts with no known implementations.
The Status column describes the status from the perspective of W3C documents:
| CSS 2.1 | The construct exists in CSS 2.1 (but may have existed in earlier versions too, and may have been extended in later versions). |
|---|---|
| ed. | Editors draft (only); might be just at an idea level, or an attempt at standardizing some practice |
| WD | Workig Draft |
| LC | Last Call (still a draft, but relatively mature) |
| CR | Candidate Recommendation (content will probably not change much) |
| REC | Recommendation, W3C standard, in the CSS3 group of specifications |
| SVG | Recommendation on SVG; currently not in CSS specifications |
| withdr. | The construct has existed in W3C drafts but has been withdrawn from them. It need not indicate rejection; some constructs have been deferred to Level 4. This category also includes constructs defined in CSS 2.0 but dropped in CSS 2.1. |
| aband. | The construct is defined in a W3C draft flagged as abandoned, and no implementations are known. |
| WHATWG | The construct is defined in a WHATWG “living standard“ |
| propos. | The construct has been proposed for standardization. |
| nonstd | The construct is not described in W3C documents, but it is recognized by some browsers. Often a vendor prefix is needed. |
| obsol. | obsolete: nonstandard, once supported in some browser(s) but not in modern versions |