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max-height 这个属性会阻止 height 属性的设置值变得比 max-height 更大。

max-height 属性用来设置给定元素的最大高度. 如果height 属性设置的高度比该属性设置的高度还大,则height 属性会失效.

max-height 重载(覆盖掉) height, 但是 min-height 又会重载(覆盖掉) max-height.

适用元素all elements but non-replaced inline elements, table columns, and column groups
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();
正规顺序the unique non-ambiguous order defined by the formal grammar


/* <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;
max-height: fill-available;

max-height: inherit;


一个固定的最大高度. 查看<length>了解可用的长度单位.
A fixed maximum height. See <length> for possible units.
The <percentage> is calculated with respect to the height of the containing block. If the height of the containing block is not specified explicitly, the percentage value is treated as none.
No limit on the height of the box.
The intrinsic preferred height.
The intrinsic minimum height.
The containing block height minus vertical margin, border and padding. Some browsers implement an ancient name for this keyword, available.

The same as max-content. 


<length> | <percentage> | none | max-content | min-content | fit-content | fill-available



table { max-height: 75%; }

form { max-height: none; }




Specification Status Comment
CSS Intrinsic & Extrinsic Sizing Module Level 3
Working Draft Adds the max-content,min-contentfit-content, and fill-available keywords.
Both CSS3 Box and CSS3 Writing Modes drafts defined at some point these keywords. These drafts are superseded by this spec.
CSS Transitions
Working Draft Defines max-height as animatable.
CSS Level 2 (Revision 1)
Recommendation Initial definition.



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Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 1.0 (1.7 or earlier) 7.0 7.0 1.0
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1) 6.0 6.0 1.0


[1] CSS 2.1 explicitely leaves the behavior of max-height with <table> undefined. Therefore any behavior is CSS2.1-compliant; newer CSS specifications may define this behavior, so Web developers shouldn't rely on a specific one now.

[2] Gecko experimentally implements the definitions given in CSS3 Basic Box. This one defines available and not fill-available. Also the definition of fit-content is simpler than in CSS3 Sizing.

[3] WebKit implements an earlier proposal for setting the height to an intrinsic height: the keywords intrinsic, instead of max-content, and min-intrinsic, instead of min-content. There is no equivalent for fill-available or fit-content.



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