max-height

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。

尝试一下

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

max-height = 
  none                                      |
  <length-percentage [0,∞]>                 |
  min-content                               |
  max-content                               |
  fit-content( <length-percentage [0,∞]> )  

<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.

Specifications

Specification
CSS Box Sizing Module Level 4
# width-height-keywords
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
PercentagesThe 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 typea length, percentage or calc();

Browser compatibility

BCD tables only load in the browser

See also