@viewport.max-width

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