max-width

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

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