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                            ## border-bottom-width 屬性
### 屬性定義及使用說明

border-bottom-width屬性設置元素的底部邊框寬度。

**注意**務必先聲明border-style屬性才可以設置border-bottom-width屬性。元素必須有邊框，你才可以改變寬度。
JavaScript 語法:object&nbsp;object.style.borderBottomWidth="thick"

## Property Values

| 值 | 說明 |
| :-- | :-- |
| thin | 定義細的下邊框 |
| medium | 默認值。定義中等的下邊框 |
| thick | 定義粗的下邊框 |
| *length* | 允許您自定義下邊框的寬度 |
| inherit | 規定應該從父元素繼承邊框寬度 |
* * *

## 實例
```
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
p 
{
border-style:solid;
border-bottom-width:15px;
}
</style>
</head>
<body>

<p><b>注意:</b> "border-bottom-width" 屬性單獨使用無效. 要先使用 "border-style"屬性設置borders .</p>

</body>
</html>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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