max-height - CSS（层叠样式表） 编辑

CSS属性 max-height 设置元素的最大高度。它防止height属性的使用值（used value） 大于 max-height 的指定值。

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max-height 会覆盖height, 而min-height 会覆盖 max-height.

Syntax

/* <length> value */
max-height: 3.5em;

/* <percentage> value */
max-height: 75%;

/* Keyword values */
max-height: none;
max-height: max-content;
max-height: min-content;
max-height: fit-content(20em);

/* Global values */
max-height: inherit;
max-height: initial;
max-height: unset;

Values

<length>

Defines the max-height as an absolute value.

<percentage>

Defines the max-height as a percentage of the containing block's height.

auto

The browser will calculate and select a max-height for the specified element.

none

No limit on the size of the box.

max-content

The intrinsic preferred max-height.

min-content

The intrinsic minimum max-height.

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, argument)).

Formal syntax

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

Examples

table { max-height: 75%; }

form { max-height: none; }

Accessibility concerns

Ensure that elements set with a max-height are not truncated and/or do not 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 | W3C Understanding WCAG 2.0

Specifications

Specification	Status	Comment
CSS Box Sizing Module Level 4 max-height	Editor's Draft
CSS Box Sizing Module Level 3 max-height	Working Draft	Adds the max-content, min-content, fit-content keywords.
CSS Level 2 (Revision 1) max-height	Recommendation	Initial definition.

初始值	none
适用元素	all elements but non-replaced inline elements, table columns, and column groups
是否是继承属性	否
Percentages	The percentage is calculated with respect to the height of the generated box's containing block. If the height of the containing block is not specified explicitly (i.e., it depends on content height), and this element is not absolutely positioned, the percentage value is treated as none.
计算值	the percentage as specified or the absolute length or none
Animation type	a length, percentage or calc();

Browser compatibility

BCD tables only load in the browser

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.

See also

• The box model, box-sizing
• height, min-height