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CSS属性 min-height 通常用来设置一个元素的最小高度。这个属性（min-height）不允许一个元素的高度（height）小于这个元素指定的最小高度（min-height）。
/* <length> value */ min-height: 3.5em; /* <percentage> value */ min-height: 10%; /* Keyword values */ min-height: max-content; min-height: min-content; min-height: fit-content; min-height: fill-available; /* Global values */ min-height: inherit; min-height: initial; min-height: unset;
直译：min-height的值会覆盖max-height 和height。（译者：这句话我的理解是，当该元素的高度小到最小高度的时候，最大高度和高度值将不会有效。）
| 初始值 | auto |
|---|---|
| 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 0. |
| 适用媒体 | visual |
| 计算值 | the percentage as specified or the absolute length |
| Animation type | a length, percentage or calc(); |
| 正规顺序 | the unique non-ambiguous order defined by the formal grammar |
Syntax
Values
<length>- 当最小高度为是一个有具体数值的时候，赋值将会使这个属性的声明无效。
<percentage>- 当最小高度是一个本身块级元素高度的百分比的时候，赋值将会使这个属性声明无效。
auto- auto 是flex元素的默认最小高度，为其他布局提供了更多合理的大于0的默认数值。
max-content- The intrinsic preferred height.
min-content- The intrinsic minimum height.
fill-available- The containing block's height minus horizontal margin, border, and padding. Some browsers implement an ancient name for this keyword,
available. fit-content- According CSS3 Box, this is a synonym of
min-content.CSS3 Sizing defines a more complex algorithm, but no browser implements it, even in an experimental way.
Formal syntax
<length> | <percentage> | auto | max-content | min-content | fit-content | fill-available
Examples
table { min-height: 75%; }
form { min-height: 0; }
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Intrinsic & Extrinsic Sizing Module Level 3 min-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 These drafts are superseded by this spec.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 Flexible Box Layout Module min-height |
Candidate Recommendation | Added the auto keyword and used it as the initial value. |
| CSS Transitions min-height |
Working Draft | Defines min-height as animatable. |
| CSS Level 2 (Revision 1) min-height |
Recommendation | Initial definition |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 1.0 | (Yes) | 3.0 (1.9) | 7.0 [3] | 4.0 | 1.0 2.0.2 (416) for positioned elements |
applies to <table> [1] |
未实现 | 未实现 | (Yes) | 未实现 | (Yes) | 未实现 |
max-content, min-content, fit-content, and fill-available |
未实现 | 未实现 | 未实现 | 未实现 | 未实现 | 9 |
auto已废弃 Gecko 22 |
21.0 | ? | 16.0 (16.0) | 未实现 | 12.10 | 未实现 |
auto as initial value已废弃 Gecko 22 |
21.0 | ? | 18.0 (18.0) | 未实现 | 12.10 | 未实现 |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | ? | ? | ? | 9 |
[1] CSS 2.1 explicitly leaves the behavior of min-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] Due to bug (bug 307866) Firefox doesn't handle min-height on elements with display: table-*.
[3] In Internet Explorer 10-11 (but not 12+), a min-height declaration on a column-direction flex container doesn't apply to the container's flex items. See Flexbug #3 for more info.
See also
width,height,max-height- The box model,
min-width,box-sizing,height,max-height