概述
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.
| 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. |
| 适用媒体 | visual |
| 计算值 | the percentage as specified or the absolute length or none |
| 是否适用于 CSS 动画 | yes, as a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a calc() function that is the sum of a length and a percentage (each possibly zero), and these calc() functions have each half interpolated as real numbers. |
| 正规顺序 | the unique non-ambiguous order defined by the formal grammar |
语法
/* <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;
值
- <length>
- 一个固定的最大高度. 查看
<length>了解可用的长度单位. - <percentage>
- 该
<percentage>值是根据包含该元素的父元素的高度计算得来的,如果该元素的父元素没有明确的指定高度,则该百分比相当于none. - none
- 不限制高度.
<length>- A fixed maximum height. See
<length>for possible units. <percentage>- 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 asnone. none- No limit on the height of the box.
max-content- The intrinsic preferred height.
min-content- The intrinsic minimum height.
fill-available- The containing block height minus vertical margin, border and padding. Some browsers implement an ancient name for this keyword,
available. fit-content
The same as max-content.
正规语法
<length> | <percentage> | none | max-content | min-content | fit-content | fill-available
例子
table { max-height: 75%; }
form { max-height: none; }Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Intrinsic & Extrinsic Sizing Module Level 3 max-height |
Working Draft | Adds the max-content,min-content, fit-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 max-height |
Working Draft | Defines max-height as animatable. |
| CSS Level 2 (Revision 1) max-height |
Recommendation | Initial definition. |
浏览器兼容性
| 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.