background-clip
background-clip 设置元素的背景(背景图片或颜色)是否延伸到边框、内边距盒子、内容盒子下面。
尝试一下
如果没有设置背景图片(background-image)或背景颜色(background-color),那么这个属性只有在边框( border)被设置为非固实(soild)、透明或半透明时才能看到视觉效果(与 border-style 或 border-image 有关),否则,本属性产生的样式变化会被边框覆盖。
语法
css
/* Keyword values */
background-clip: border-box;
background-clip: padding-box;
background-clip: content-box;
background-clip: text;
/* Global values */
background-clip: inherit;
background-clip: initial;
background-clip: unset;
值
border-box- 
    
背景延伸至边框外沿(但是在边框下层)。
 padding-box- 
    
背景延伸至内边距(
padding)外沿。不会绘制到边框处。 content-box- 
    
背景被裁剪至内容区(content box)外沿。
 text实验性- 
    
背景被裁剪成文字的前景色。
 
标准语法
示例
HTML
html
<p class="border-box">The background extends behind the border.</p>
<p class="padding-box">The background extends to the inside edge of the border.</p>
<p class="content-box">The background extends only to the edge of the content box.</p>
<p class="text">The background is clipped to the foreground text.</p>
CSS
css
p {
  border: .8em darkviolet;
  border-style: dotted double;
  margin: 1em 0;
  padding: 1.4em;
  background: linear-gradient(60deg, red, yellow, red, yellow, red);
  font: 900 1.2em sans-serif;
  text-decoration: underline;
}
.border-box { background-clip: border-box; }
.padding-box { background-clip: padding-box; }
.content-box { background-clip: content-box; }
.text {
  background-clip: text;
  -webkit-background-clip: text;
  color: rgba(0,0,0,.2);
}
结果
规范
| Specification | 
|---|
| CSS Backgrounds and Borders Module Level 3  # background-clip  | 
| 初始值 | border-box | 
|---|---|
| 适用元素 | all elements. It also applies to ::first-letter and ::first-line. | 
| 是否是继承属性 | 否 | 
| 计算值 | as specified | 
| Animation type | a repeatable list of | 
浏览器兼容性
BCD tables only load in the browser
参见
- The 
clip-pathproperty creates a clipping region that defines what part of an entire element should be displayed. - Background properties: 
background,background-color,background-image - Introduction to the CSS box model