Summary
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.
| Related at-rule | @viewport |
|---|---|
| Initial value | auto |
| Percentages | refer to the width of the initial viewport |
| Media | visual, continuous |
| Computed value | if specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto |
| Canonical order | the unique non-ambiguous order defined by the formal grammar |
Syntax
/* Keyword value */ max-width: auto; max-width: none; /* <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.
- none
- 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 syntax
<viewport-length>where
<viewport-length> = auto | <length-percentage>where
<length-percentage> = <length> | <percentage>
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Device Adaptation The definition of '"max-width" descriptor' in that specification. |
Working Draft | Initial definition |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 29 (behind a flag) | No support | 10 -ms | 11.10 Removed in 15 Reintroduced behind a flag in 16 |
No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 4.4 | 29 | No support | 10-ms | 11.10 Removed in 15 Reintroduced behind a flag in 16 |
No support |