CSS Reference

CSS Reference CSS Selectors CSS Functions CSS Reference Aural CSS Web Safe Fonts CSS Animatable CSS Units CSS PX-EM Converter CSS Colors CSS Color Values CSS3 Browser Support

CSS Properties

align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-shadow box-sizing caption-side clear clip color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-size font-size-adjust font-stretch font-style font-variant font-weight hanging-punctuation height justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width nav-down nav-index nav-left nav-right nav-up opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin position quotes resize right tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi vertical-align visibility white-space width word-break word-spacing word-wrap z-index


CSS Units

CSS Units

CSS has several different units for length.

Some properties that set CSS length are width, margin, padding, font-size, border-width, etc.

The length has a number and unit composition such as 10px, 2em, etc.

There must be no spaces between numbers and units. If the length value is 0, units can be omitted.

For some CSS properties, the length can be negative.

There are two types of length units: relative and absolute.

Browser Support

The numbers in the table below indicate the minimum browser version that supports this unit of length.

Length Unit
em, ex, %, px, cm, mm, in, pt, pc 1.0 3.0 1.0 1.0 3.5
ch 27.0 9.0 1.0 7.0 20.0
rem 4.0 9.0 3.6 4.1 11.6
vh, vw 20.0 9.0 19.0 6.0 20.0
vmin 20.0 9.0* 19.0 6.0 20.0
vmax 26.0 Not supported 19.0 Not supported 20.0

Note: Internet Explorer 9 underpins vmin with the non-standard name: vm.

Relative Lengths

Relative length units indicate a length in respect to another length property. Relative length units scales better between various rendering mediums.

Unit Description
em Relative to the text dimension of the component (2em methods multiple times the span of the present textual style)
ex Relative to the x-tallness of the present textual style (once in a while utilized)
ch Relative to width of the "0" (zero)
rem Relative to text dimension of the root element
vw Relative to 1% of the width of the viewport*
vh Relative to 1% of the tallness of the viewport*
vmin Relative to 1% of viewport's* littler measurement
vmax Relative to 1% of viewport's* bigger measurement

Absolute Lengths

The absolute length unit is a fixed value, which reflects a real physical size. The absolute length unit depends on the output medium and is independent of the environment (display, resolution, operating system, etc.).

Unit Description
cm centimeters
mm millimeters
in inches (1in = 96px = 2.54cm)
px * pixels (1px = 1/96th of 1in)
pt points (1pt = 1/72 of 1in)
pc picas (1pc = 12 pt)

* Pixels (px) are with respect to the review gadget. For low-dpi gadgets, 1px is one gadget pixel (spot) of the showcase. For printers and high goals screens 1px infers numerous gadget pixels.