The system descriptor specifies the algorithm to be used for converting the integer value of a counter to a string representation. It is used in a @counter-style to define the behavior of the defined style.

@counter-style CSS CSS Counter Styles CSS Descriptor NeedsLiveSample Reference

The font-family CSS descriptor allows authors to specify the font family for the font specified in an @font-face rule.

@font-face CSS CSS Descriptor CSS Fonts Reference

The src CSS descriptor of the @font-face rule specifies the resource containing font data. It is required for the @font-face rule to be valid.

@font-face CSS CSS Descriptor CSS Fonts NeedsMobileBrowserCompatibility Reference

The unicode-range CSS descriptor sets the specific range of characters to be used from a font defined by @font-face and made available for use on the current page. If the page doesn't use any character in this range, the font is not downloaded; if it uses at least one, the whole font is downloaded.

CSS CSS Fonts CSS Property Experimental Layout Reference Web

The @supports CSS at-rule associates a set of nested statements, in a CSS block, that is delimited by curly braces, with a condition consisting of testing of CSS declarations, that is property-value pairs, combined with arbitrary conjunctions, disjunctions, and negations of them. Such a condition is called a supports condition.

At-rule CSS CSS3 CSS3-conditionals Layout Reference Web

The CSS align-content property aligns a flex container's lines within the flex container when there is extra space on the cross-axis.

CSS CSS Flexible Boxes CSS Property NeedsMobileBrowserCompatibility Reference

The CSS align-items property aligns flex items of the current flex line the same way as justify-content but in the perpendicular direction.

CSS CSS Flexible Boxes CSS Property NeedsExample Reference

The align-self CSS property aligns flex items of the current flex line overriding the align-items value. If any of the flex item's cross-axis margin is set to auto, then align-self is ignored.

CSS CSS Flexible Boxes CSS Property NeedsExample NeedsMobileBrowserCompatibility Reference

The animation-fill-mode CSS property specifies how a CSS animation should apply styles to its target before and after it is executing.

CSS CSS Animations CSS Property Experimental NeedsMobileBrowserCompatibility Reference

The animation-play-state CSS property determines whether an animation is running or paused. This can be queried to determine whether or not the animation is currently running. In addition, its value can be set to pause and resume playback of an animation.

CSS CSS Animations CSS Property Experimental NeedsMobileBrowserCompatibility Reference

The background-color CSS property sets the background color of an element, either through a color value or the keyword transparent.

CSS CSS Background CSS Property Graphics Layout Reference

The background-position-x CSS property sets the initial horizontal position, relative to the background position layer defined by background-origin for each defined background image. For more information, see the background-position property, which has been widely supported.

CSS CSS Background CSS Property Experimental NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Reference

The <basic-shape> type can be specified using basic shape functions. When using this syntax to define shapes, the reference box is defined by each property that uses <basic-shape> values. The coordinate system for the shape has its origin on the top-left corner of the reference box with the x-axis running to the right and the y-axis running downwards. All the lengths expressed in percentages are resolved from the used dimensions of the reference box.

CSS CSS Data Type CSS Shapes NeedsExample Reference Référence

CSS CSS Logical Property CSS Property Experimental Reference

The border CSS property is a shorthand property for setting the individual border property values in a single place in the style sheet. border can be used to set the values for one or more of: border-width, border-style, border-color.

CSS CSS Borders CSS Property Layout NeedsMobileBrowserCompatibility Reference Web

CSS CSS Logical Property CSS Property Experimental Reference

CSS CSS Logical Property CSS Property Experimental Reference

CSS CSS Logical Property CSS Property Experimental NeedsContent Reference

CSS CSS Logical Property CSS Property Experimental NeedsContent Reference

CSS CSS Logical Property CSS Property Experimental Reference