CSS Reference

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CSS Properties

CSS Property Groups

The "CSS" column indicates in which CSS version the property is defined (CSS1, CSS2, or CSS3).

Color Properties

Property	Description	CSS
color	Sets the color of text	1
opacity	Sets the opacity level for an element	3

Background and Border Properties

Property	Description	CSS
background	Sets all the background properties in one declaration	1
background-attachment	Sets whether a background image is fixed or scrolls with the rest of the page	1
background-color	Sets the background color of an element	1
background-image	Sets the background image for an element	1
background-position	Sets the starting position of a background image	1
background-repeat	Sets how a background image will be repeated	1
background-clip	Specifies the painting area of the background	3
background-origin	Specifies the positioning area of the background images	3
background-size	Specifies the size of the background images	3
border	Sets all the border properties in one declaration	1
border-bottom	Sets all the bottom border properties in one declaration	1
border-bottom-color	Sets the color of the bottom border	1
border-bottom-left-radius	Defines the shape of the border of the bottom-left corner	3
border-bottom-right-radius	Defines the shape of the border of the bottom-right corner	3
border-bottom-style	Sets the style of the bottom border	1
border-bottom-width	Sets the width of the bottom border	1
border-color	Sets the color of the four borders	1
border-image	A shorthand property for setting all the border-image-* properties	3
border-image-outset	Specifies the amount by which the border image area extends beyond the border box	3
border-image-repeat	Specifies whether the image-border should be repeated, rounded or stretched	3
border-image-slice	Specifies the inward offsets of the image-border	3
border-image-source	Specifies an image to be used as a border	3
border-image-width	Specifies the widths of the image-border	3
border-left	Sets all the left border properties in one declaration	1
border-left-color	Sets the color of the left border	1
border-left-style	Sets the style of the left border	1
border-left-width	Sets the width of the left border	1
border-radius	A shorthand property for setting all the four border-*-radius properties	3
border-right	Sets all the right border properties in one declaration	1
border-right-color	Sets the color of the right border	1
border-right-style	Sets the style of the right border	1
border-right-width	Sets the width of the right border	1
border-style	Sets the style of the four borders	1
border-top	Sets all the top border properties in one declaration	1
border-top-color	Sets the color of the top border	1
border-top-left-radius	Defines the shape of the border of the top-left corner	3
border-top-right-radius	Defines the shape of the border of the top-right corner	3
border-top-style	Sets the style of the top border	1
border-top-width	Sets the width of the top border	1
border-width	Sets the width of the four borders	1
box-decoration-break	Sets the behaviour of the background and border of an element at page-break, or, for in-line elements, at line-break.	3
box-shadow	Attaches one or more drop-shadows to the box	3

Basic Box Properties

Property	Description	CSS
bottom	Specifies the bottom position of a positioned element	2
clear	Specifies which sides of an element where other floating elements are not allowed	1
clip	Clips an absolutely positioned element	2
display	Specifies how a certain HTML element should be displayed	1
float	Specifies whether or not a box should float	1
height	Sets the height of an element	1
left	Specifies the left position of a positioned element	2
overflow	Specifies what happens if content overflows an element's box	2
overflow-x	Specifies whether or not to clip the left/right edges of the content, if it overflows the element's content area	3
overflow-y	Specifies whether or not to clip the top/bottom edges of the content, if it overflows the element's content area	3
padding	Sets all the padding properties in one declaration	1
padding-bottom	Sets the bottom padding of an element	1
padding-left	Sets the left padding of an element	1
padding-right	Sets the right padding of an element	1
padding-top	Sets the top padding of an element	1
position	Specifies the type of positioning method used for an element (static, relative, absolute or fixed)	2
right	Specifies the right position of a positioned element	2
top	Specifies the top position of a positioned element	2
visibility	Specifies whether or not an element is visible	2
width	Sets the width of an element	1
vertical-align	Sets the vertical alignment of an element	1
z-index	Sets the stack order of a positioned element	2

Flexible Box Layout

Property	Description	CSS
align-content	Specifies the alignment between the lines inside a flexible container when the items do not use all available space.	3
align-items	Specifies the alignment for items inside a flexible container.	3
align-self	Specifies the alignment for selected items inside a flexible container.	3
display	Specifies how a certain HTML element should be displayed	1
flex	Specifies the length of the item, relative to the rest	3
flex-basis	Specifies the initial length of a flexible item	3
flex-direction	Specifies the direction of the flexible items	3
flex-flow	A shorthand property for the flex-direction and the flex-wrap properties	3
flex-grow	Specifies how much the item will grow relative to the rest	3
flex-shrink	Specifies how the item will shrink relative to the rest	3
flex-wrap	Specifies whether the flexible items should wrap or not	3
justify-content	Specifies the alignment between the items inside a flexible container when the items do not use all available space.	3
margin	Sets all the margin properties in one declaration	1
margin-bottom	Sets the bottom margin of an element	1
margin-left	Sets the left margin of an element	1
margin-right	Sets the right margin of an element	1
margin-top	Sets the top margin of an element	1
max-height	Sets the maximum height of an element	2
max-width	Sets the maximum width of an element	2
min-height	Sets the minimum height of an element	2
min-width	Sets the minimum width of an element	2
order	Sets the order of the flexible item, relative to the rest	3

Text Properties

Property	Description	CSS
hanging-punctuation	Specifies whether a punctuation character may be placed outside the line box	3
hyphens	Sets how to split words to improve the layout of paragraphs	3
letter-spacing	Increases or decreases the space between characters in a text	1
line-break		3
line-height	Sets the line height	1
overflow-wrap		3
tab-size	Specifies the length of the tab-character	3
text-align	Specifies the horizontal alignment of text	1
text-align-last	Describes how the last line of a block or a line right before a forced line break is aligned when text-align is "justify"	3
text-indent	Specifies the indentation of the first line in a text-block	1
text-justify	Specifies the justification method used when text-align is "justify"	3
text-transform	Controls the capitalization of text	1
white-space	Specifies how white-space inside an element is handled	1
word-break	Specifies line breaking rules for non-CJK scripts	3
word-spacing	Increases or decreases the space between words in a text	1
word-wrap	Allows long, unbreakable words to be broken and wrap to the next line	3

Text Decoration Properties

Property	Description	CSS
text-decoration	Specifies the decoration added to text	1
text-decoration-color	Specifies the color of the text-decoration	3
text-decoration-line	Specifies the type of line in a text-decoration	3
text-decoration-style	Specifies the style of the line in a text decoration	3
text-shadow	Adds shadow to text	3
text-underline-position		3

Font Properties

Property	Description	CSS
font	Sets all the font properties in one declaration	1
font-family	Specifies the font family for text	1
font-feature-setting		3
@font-feature-values		3
font-kerning		3
font-language-override		3
font-synthesis		3
font-variant-alternates		3
font-variant-caps		3
font-variant-east-asian		3
font-variant-ligatures		3
font-variant-numeric		3
font-variant-position		3
font-size	Specifies the font size of text	1
font-style	Specifies the font style for text	1
font-variant	Specifies whether or not a text should be displayed in a small-caps font	1
font-weight	Specifies the weight of a font	1
@font-face	A rule that allows websites to download and use fonts other than the "web-safe" fonts	3
font-size-adjust	Preserves the readability of text when font fallback occurs	3
font-stretch	Selects a normal, condensed, or expanded face from a font family	3

Writing Modes Properties

Property	Description	CSS
direction	Specifies the text direction/writing direction	2
text-orientation		3
text-combine-horizontal		3
unicode-bidi	Used together with the direction property to set or return whether the text should be overridden to support multiple languages in the same document	2
writing-mode		3

Table Properties

Property	Description	CSS
border-collapse	Specifies whether or not table borders should be collapsed	2
border-spacing	Specifies the distance between the borders of adjacent cells	2
caption-side	Specifies the placement of a table caption	2
empty-cells	Specifies whether or not to display borders and background on empty cells in a table	2
table-layout	Sets the layout algorithm to be used for a table	2

Lists and Counters Properties

Property	Description	CSS
counter-increment	Increments one or more counters	2
counter-reset	Creates or resets one or more counters	2
list-style	Sets all the properties for a list in one declaration	1
list-style-image	Specifies an image as the list-item marker	1
list-style-position	Specifies if the list-item markers should appear inside or outside the content flow	1
list-style-type	Specifies the type of list-item marker	1

Animation Properties

Property	Description	CSS
@keyframes	Specifies the animation	3
animation	A shorthand property for all the animation properties below, except the animation-play-state property	3
animation-delay	Specifies when the animation will start	3
animation-direction	Specifies whether or not the animation should play in reverse on alternate cycles	3
animation-duration	Specifies how many seconds or milliseconds an animation takes to complete one cycle	3
animation-fill-mode	Specifies what values are applied by the animation outside the time it is executing	3
animation-iteration-count	Specifies the number of times an animation should be played	3
animation-name	Specifies a name for the @keyframes animation	3
animation-timing-function	Specifies the speed curve of the animation	3
animation-play-state	Specifies whether the animation is running or paused	3

Transform Properties

Property	Description	CSS
backface-visibility	Defines whether or not an element should be visible when not facing the screen	3
perspective	Specifies the perspective on how 3D elements are viewed	3
perspective-origin	Specifies the bottom position of 3D elements	3
transform	Applies a 2D or 3D transformation to an element	3
transform-origin	Allows you to change the position on transformed elements	3
transform-style	Specifies how nested elements are rendered in 3D space	3

Transitions Properties

Property	Description	CSS
transition	A shorthand property for setting the four transition properties	3
transition-property	Specifies the name of the CSS property the transition effect is for	3
transition-duration	Specifies how many seconds or milliseconds a transition effect takes to complete	3
transition-timing-function	Specifies the speed curve of the transition effect	3
transition-delay	Specifies when the transition effect will start	3

Basic User Interface Properties

Property	Description	CSS
box-sizing	Tells the browser what the sizing properties (width and height) should include	3
content	Used with the :before and :after pseudo-elements, to insert generated content	2
cursor	Specifies the type of cursor to be displayed	2
icon	Provides the author the ability to style an element with an iconic equivalent	3
ime-mode		3
nav-down	Specifies where to navigate when using the arrow-down navigation key	3
nav-index	Specifies the tabbing order for an element	3
nav-left	Specifies where to navigate when using the arrow-left navigation key	3
nav-right	Specifies where to navigate when using the arrow-right navigation key	3
nav-up	Specifies where to navigate when using the arrow-up navigation key	3
outline	Sets all the outline properties in one declaration	2
outline-color	Sets the color of an outline	2
outline-offset	Offsets an outline, and draws it beyond the border edge	3
outline-style	Sets the style of an outline	2
outline-width	Sets the width of an outline	2
resize	Specifies whether or not an element is resizable by the user	3
text-overflow	Specifies what should happen when text overflows the containing element	3

Multi-column Layout Properties

Property	Description	CSS
break-after		3
break-before