The max-width
CSS descriptor specifies the maximum width of the viewport of a document defined via the @viewport
at-rule.
By default, the width is set as close as possible to the initial viewport considering the maximum width constraint.
Syntax
/* Keyword value */ max-width: auto; /* <length> values */ max-width: 600px; max-width: 80em; max-width: 15cm; /* <percentage> value */ max-width: 75%;
Values
auto
- The used value is calculated from the other CSS descriptors' values.
<length>
- A non-negative absolute or relative length.
<percentage>
- A percentage value relative to the width of the initial viewport at zoom factor 1.0 for horizontal lengths. Must be non-negative.
Formal definition
Related at-rule | @viewport |
---|---|
Initial value | auto |
Percentages | refer to the width of the initial viewport |
Computed value | if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto |
Formal syntax
<viewport-length>where
<viewport-length> = auto | <length-percentage>
where
<length-percentage> = <length> | <percentage>
Examples
Setting viewport max width in pixels
@viewport { max-width: 600px; }
Specifications
Specification | Status | Comment |
---|---|---|
CSS Device Adaptation The definition of '"max-width" descriptor' in that specification. |
Working Draft | 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
max-width descriptor | Chrome No support 29 — 84 | Edge
Full support
12
| Firefox No support No | IE
Full support
10
| Opera
Full support
16
| Safari No support No | WebView Android No support 4.4 — 37 | Chrome Android No support 29 — 84 | Firefox Android No support No | Opera Android
Full support
16
| Safari iOS No support No | Samsung Internet Android Full support 2.0 |
Legend
- Full support
- Full support
- No support
- No support
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.