height

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height CSS 属性指定了一个元素的高度。默认情况下,这个属性决定的是内容区( content area)的高度,但是,如果将 box-sizing 设置为  border-box , 这个属性决定的将是边框区域(border area)的高度。
min-heightmax-height 属性会覆盖  height

语法

/* Keyword value */
height: auto;

/* <length> values */
height: 120px;
height: 10em;

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

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

<length>
将高度定义为一个绝对值。
<percentage>
将高度定义为相对包含块高度的百分比。
border-box 
如果设置该值,则 <length> 或者 <percentage> 会设置为该元素的 border box。
content-box 
如果设置该值,则 <length> 或者 <percentage> 会设置为该元素的 content box。
auto
由浏览器为元素计算并选择一个高度。
fill 
根据文字方向,使用 fill-available 作为行大小或者块大小。
max-content 
设置为允许的最大高度。
min-content 
设置为允许的最小高度.
available 
包含块高度减去当前元素的边距,边框和填充。
fit-content 
将 fill-content 公式中的可用位置替换为特定的参数以进行使用,如:min(max-content, max(min-content, ))

Formal syntax

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

where
<length-percentage> = <length> | <percentage>

示例

HTML

<div id="taller">I'm 50 pixels tall.</div>
<div id="shorter">I'm 25 pixels tall.</div>
<div id="parent">
  <div id="child">
    I'm half the height of my parent.
  </div>
</div>

CSS

div {
  width: 250px;
  margin-bottom: 5px;
  border: 2px solid blue;
}

#taller {
  height: 50px;
}

#shorter {
  height: 25px;
}

#parent {
  height: 100px;
}

#child {
  height: 50%;
  width: 75%;
}

结果

无障碍问题

确保设定了 height 的元素在显示上不会被截断,或者当页面放大时增大的字体大小不会遮挡其他内容。 

规范

Specification Status Comment
CSS Basic Box Model
height
Working Draft Added the max-contentmin-contentavailablefit-contentborder-boxcontent-boxkeywords.
CSS Transitions
height
Working Draft Lists height as animatable.
CSS Level 2 (Revision 1)
height
Recommendation Adds support for the <length> values and precises on which element it applies to.
CSS Level 1
height
Recommendation Initial definition.
CSS Intrinsic & Extrinsic Sizing Module Level 3
width
Working Draft Adds new sizing keywords for width and height.
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
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 value computes to auto. A percentage height on the root element is relative to the initial containing block.
计算值a percentage or auto or the absolute length
Animation typea length, percentage or calc();

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
heightChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 7Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0
fit-contentChrome Full support 46Edge Full support 79Firefox No support NoIE No support NoOpera Full support 33Safari Full support 11
Full support 11
Full support 9
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
WebView Android Full support 46Chrome Android Full support 46Firefox Android No support NoOpera Android Full support 33Safari iOS Full support 11
Full support 11
Full support 9
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android Full support 5.0
max-contentChrome Full support 46Edge Full support 79Firefox Full support 66
Full support 66
Full support 3
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 46Chrome Android Full support 46Firefox Android Full support 66
Full support 66
Full support 4
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
Opera Android Full support 43Safari iOS Full support 11Samsung Internet Android Full support 5.0
min-contentChrome Full support 46Edge Full support 79Firefox Full support 66
Full support 66
Full support 3
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 46Chrome Android Full support 46Firefox Android Full support 66
Full support 66
Full support 4
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
Opera Android Full support 43Safari iOS Full support 11Samsung Internet Android Full support 5.0
stretchChrome Full support 28
Alternate Name
Full support 28
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Edge Full support 79
Alternate Name
Full support 79
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Firefox No support NoIE No support NoOpera Full support 15
Alternate Name
Full support 15
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Safari Full support 9
Alternate Name
Full support 9
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
WebView Android Full support 4.4
Alternate Name
Full support 4.4
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Chrome Android Full support 28
Alternate Name
Full support 28
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Firefox Android No support NoOpera Android Full support 15
Alternate Name
Full support 15
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Safari iOS Full support 9
Alternate Name
Full support 9
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
Samsung Internet Android Full support 5.0
Alternate Name
Full support 5.0
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available

Legend

Full support  
Full support
No support  
No support
Uses a non-standard name.
Uses a non-standard name.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

参见