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Summary
height
指定元素内容区高度。 内容区 content area 在元素padding, border, and margin 的里面。
min-height
与 max-height
覆盖 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 | 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 value computes to auto . A percentage height on the root element is relative to the initial containing block. |
适用媒体 | visual |
计算值 | a percentage or auto 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
Formal syntax: [ <length> | <percentage> ] && [ border-box | content-box ]? | available | min-content | max-content | fit-content | auto
height: auto /* auto keyword */ height: 120px /* <length> values */ height: 10em height: 75% /* <percentage> values */ height: inherit
Values
<length>
- 可用单位查看
<length>
。 <percentage>
<percentage>
相对于元素的块容器高度。如果块容器的高度没有显式指定,计算值为auto。
用在root 元素 (e.g.<html>
) 上是相对于初始块容器(即显示器的尺寸)。auto
- 由浏览器计算确定。
Example
HTML
<div id="red"> <span>I'm 50 pixels tall.</span> </div> <div id="green"> <span>I'm 25 pixels tall.</span> </div> <div id="parent"> <div id="child"> <span>I'm half the height of my parent.</span> </div> </div>
CSS
div { width: 250px; margin-bottom: 5px; border: 3px solid #999999; } #red { height: 50px; } #green { height: 25px; } #parent { height: 100px; } #child { height: 50%; width: 75%; }
Specifications
Specification | Status | Comment |
---|---|---|
CSS Basic Box Model height |
Working Draft | Added the max-content , min-content , available , fit-content , border-box , content-box keywords. |
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 specification. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 1.0 | 1.0 (1.7 or earlier) | 4.0 | 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 |