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css属性 border-top-width 是用于设置盒模型的上边框的宽度

Syntax

/* Keyword values */
border-top-width: thin;
border-top-width: medium;
border-top-width: thick;

/* <length> values */
border-top-width: 10em;
border-top-width: 3vmax;
border-top-width: 6px;

/* Global keywords */
border-top-width: inherit;
border-top-width: initial;
border-top-width: unset;

Values

<br-width>
上边框的宽度属性的有效值要么是一个具体的非负数,要么是一个关键字。如果是关键字,必须是一下几种:
thin
 
A thin border
medium
 
A medium border
thick
 
A thick border

Note: Because the specification doesn't define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern thin ≤ medium ≤ thick, and the values are constant within a single document.

Formal syntax

<br-width>

where
<br-width> = <length> | thin | medium | thick

Example

HTML

<div>Element 1</div>
<div>Element 2</div>

CSS

div { 
  border: 1px solid red;
  margin: 1em 0;
}

div:nth-child(1) {
  border-top-width: thick;
}
div:nth-child(2) {
  border-top-width: 2em;
}

Result

Specifications

Specification Status Comment
CSS Backgrounds and Borders Module Level 3
border-top-width
Candidate Recommendation No significant change.
CSS Level 2 (Revision 1)
border-top-width
Recommendation No significant change.
CSS Level 1
border-top-width
Recommendation Initial definition.

初始值medium
适用元素all elements. It also applies to ::first-letter.
是否是继承属性
适用媒体visual
计算值the absolute length or 0 if border-top-style is none or hidden
Animation typea length
正规顺序the unique non-ambiguous order defined by the formal grammar

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support112143.51
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support2.3 ? Yes4111 ?

See also

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