```html
```
```css
color: #ff0000;
font-size: 16px;
text-decoration: none;
font-weight: bold;
```
```css
color: #ff0000;
font-size: 16px;
text-decoration: none;
font-weight: bold;
color: #0086b3;
```
```javascript
link.addEventListener('click', function() {
document.querySelector('body').style.color = 'red';
});
```
應用場景：
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