Web/CSS/width

The width CSS property sets an element's width. By default, it sets the width of the content area, but if box-sizing is set to border-box, it sets the width of the border area.

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The min-width and max-width properties override width.

Syntax

/* <length> values */
width: 300px;
width: 25em;

/* <percentage> value */
width: 75%;

/* Keyword values */
width: max-content;
width: min-content;
width: fit-content(20em);
width: auto;

/* Global values */
width: inherit;
width: initial;
width: unset;

The width property is specified as either:

• one of the following keyword values: min-content, max-content, fit-content, auto.
• a <length> or a <percentage>.

Values

<length>

Defines the width as an absolute value.

<percentage>

Defines the width as a percentage of the containing block's width.

auto

The browser will calculate and select a width for the specified element.

max-content

The intrinsic preferred width.

min-content

The intrinsic minimum width.

fit-content(<length-percentage>)

Uses the fit-content formula with the available space replaced by the specified argument, i.e. min(max-content, max(min-content, <length-percentage>)).

Accessibility concerns

Ensure that elements set with a width aren't truncated and don't obscure other content when the page is zoomed to increase text size.

• MDN Understanding WCAG, Guideline 1.4 explanations
• Understanding Success Criterion 1.4.4 | Understanding WCAG 2.0

Formal definition

Initial value	auto
Applies to	all elements but non-replaced inline elements, table rows, and row groups
Inherited	no
Percentages	refer to the width of the containing block
Computed value	a percentage or auto or the absolute length
Animation type	a length, percentage or calc();

Formal syntax

auto | <length> | <percentage> | min-content | max-content | fit-content(<length-percentage>)where <length-percentage> = <length> | <percentage>

Examples

Default width

p.goldie {
  background: gold;
}

<p class="goldie">The Mozilla community produces a lot of great software.</p>

Pixels and ems

.px_length {
  width: 200px;
  background-color: red;
  color: white;
  border: 1px solid black;
}

.em_length {
  width: 20em;
  background-color: white;
  color: red;
  border: 1px solid black;
}

<div class="px_length">Width measured in px</div>
<div class="em_length">Width measured in em</div>

Percentage

.percent {
  width: 20%;
  background-color: silver;
  border: 1px solid red;
}

<div class="percent">Width in percentage</div>

max-content

p.maxgreen {
  background: lightgreen;
  width: intrinsic;           /* Safari/WebKit uses a non-standard name */
  width: -moz-max-content;    /* Firefox/Gecko */
  width: -webkit-max-content; /* Chrome */
  width: max-content;
}

<p class="maxgreen">The Mozilla community produces a lot of great software.</p>

min-content

p.minblue {
  background: lightblue;
  width: -moz-min-content;    /* Firefox */
  width: -webkit-min-content; /* Chrome */
  width: min-content;
}

<p class="minblue">The Mozilla community produces a lot of great software.</p>

Specifications

Specification	Status	Comment
CSS Box Sizing Module Level 4The definition of 'width' in that specification.	Editor's Draft
CSS Box Sizing Module Level 3The definition of 'width' in that specification.	Working Draft	Added the max-content, min-content, fit-content keywords.
CSS Level 2 (Revision 1)The definition of 'width' in that specification.	Recommendation	Precises on which element it applies to.
CSS Level 1The definition of 'width' in that specification.	Recommendation	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
width	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 3.5	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0
Animatable	Chrome Full support 26	Edge Full support 12	Firefox Full support 16	IE Full support 11	Opera Full support 15	Safari Full support 6.1	WebView Android Full support 4.4	Chrome Android Full support 26	Firefox Android Full support 16	Opera Android Full support 14	Safari iOS Full support 6.1	Samsung Internet Android Full support 1.5
fill Experimental'Non-standard'	Chrome Full support 46	Edge Full support 79	Firefox No support No	IE No support No	Opera Full support 33	Safari Full support 12	WebView Android Full support 46	Chrome Android Full support 46	Firefox Android No support No	Opera Android Full support 33	Safari iOS Full support 12	Samsung Internet Android Full support 5.0
fit-content	Chrome Full support 46 Full support 46 Full support 22 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 1 — 48 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Edge Full support 79 Full support 79 Full support 79 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Firefox Full support 3 Prefixed' Full support 3 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	IE No support No	Opera Full support 33 Full support 33 Full support 15 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 15 — 35 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Safari Full support 11 Full support 11 Full support 6.1 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- Full support 2 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	WebView Android Full support 46 Full support 46 Full support ≤37 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 1 — 48 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Chrome Android Full support 46 Full support 46 Full support 25 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 18 — 48 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Firefox Android Full support 4 Prefixed' Full support 4 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	Opera Android Full support 33 Full support 33 Full support 14 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 14 — 35 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Safari iOS Full support 11 Full support 11 Full support 7 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- Full support 1 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Samsung Internet Android Full support 5.0 Full support 5.0 Full support 1.5 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit- No support 1.0 — 5.0 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic
max-content	Chrome Full support 46 Full support 46 Full support 22 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Edge Full support 79 Full support 79 Full support 79 Prefixed' Prefixed' Implemented with the vendor prefix: -webkit-	Firefox Full support 66 Full support 66 Full support 3 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	IE No support No	Opera Full support 44	Safari Full support 11 Full support 11 Full support 2 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	WebView Android Full support 46	Chrome Android Full support 46	Firefox Android Full support 66 Full support 66 Full support 4 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	Opera Android Full support 43	Safari iOS Full support 11 Full support 11 Full support 1 Alternate Name' Alternate Name' Uses the non-standard name: intrinsic	Samsung Internet Android Full support 5.0
min-content	Chrome Full support 46 Full support 46 No support 1 — 48 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Edge Full support 79	Firefox Full support 66 Full support 66 Full support 3 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	IE No support No	Opera Full support 33 Full support 33 No support 15 — 35 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Safari Full support 11 Full support 11 Full support 2 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	WebView Android Full support 46 Full support 46 No support 1 — 48 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Chrome Android Full support 46 Full support 46 No support 18 — 48 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Firefox Android Full support 66 Full support 66 Full support 4 Prefixed' Prefixed' Implemented with the vendor prefix: -moz-	Opera Android Full support 33 Full support 33 No support 14 — 35 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Safari iOS Full support 11 Full support 11 Full support 1 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic	Samsung Internet Android Full support 5.0 Full support 5.0 No support 1.0 — 5.0 Alternate Name' Alternate Name' Uses the non-standard name: min-intrinsic
stretch Experimental'	Chrome Full support 22 Alternate Name' Full support 22 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Edge Full support 79 Alternate Name' Full support 79 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Firefox Full support 3 Alternate Name' Full support 3 Alternate Name' Alternate Name' Uses the non-standard name: -moz-available	IE No support No	Opera Full support 15 Alternate Name' Full support 15 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Safari Full support 6.1 Alternate Name' Full support 6.1 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	WebView Android Full support 4.4 Alternate Name' Full support 4.4 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Chrome Android Full support 25 Alternate Name' Full support 25 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Firefox Android Full support 4 Alternate Name' Full support 4 Alternate Name' Alternate Name' Uses the non-standard name: -moz-available	Opera Android Full support 14 Alternate Name' Full support 14 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Safari iOS Full support 6.1 Alternate Name' Full support 6.1 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available	Samsung Internet Android Full support 5.0 Alternate Name' Full support 5.0 Alternate Name' Alternate Name' Uses the non-standard name: -webkit-fill-available

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

Non-standard. Expect poor cross-browser support.'

Non-standard. Expect poor cross-browser support.

Uses a non-standard name.'

Uses a non-standard name.

Requires a vendor prefix or different name for use.'

Requires a vendor prefix or different name for use.

See also

• box model
• height
• box-sizing
• min-width, max-width
• The mapped logical properties: block-size, inline-size

width by Mozilla Contributors is licensed under CC-BY-SA 2.5.