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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

<line-width>

where
<line-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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 3.5Safari Full support 1WebView Android Full support 2.3Chrome Android ? Edge Mobile Full support YesFirefox Android Full support 4Opera Android Full support 11Safari iOS Full support 1Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

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