Detailed explanation of how to use the clip-path area cropping attribute in CSS

clip-path can divide the elements of the page into the areas to be displayed according to the set size, or it is equivalent to masking rather than actually cutting off a certain part. Here we will take a look at clip-path in CSS Area clipping attribute usage tutorial

clip-path in CSS allows you to specify the display area of ​​a web page element instead of the default display of all.

.clip-me {     

  /* 已被标志为不推荐使用的写法 */
  position: absolute; /* 需要 absolute 和 fixed 定位 */
  clip: rect(110px, 160px, 170px, 60px); /* 或 "auto" */
  /* 值描述的是一个 top/left 点和一个 bottom/right 点 */

  /* 最新规范写法 (没有定位要求)， */
  clip-path: inset(10px 20px 30px 40px); /* or "none" */
  /* 值指的是 top, right, bottom, left 四个点 */


}

There are four values ​​in the inset() function in the clip-path attribute value, which express the four points of top/left and bottom/right respectively, and circle a rectangle area. The parts outside this rectangular area will be cropped and hidden.

It should be noted that the values ​​are separated by spaces, while the old-fashioned ones use commas.

Example:

Look at this effect and crop this p.

The code is as follows:

<p class="haorooms-small" style="background-image: url(&#39;http://sandbox.runjs.cn/uploads/rs/216/0y89gzo2/idtga8h3.png&#39;);">
  </p>

.haorooms-small {   
    background-size: cover;   
    width: 300px;   
    height: 300px;   
    -webkit-clip-path: polygon(0% 50%, 25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%);   
    clip-path: polygon(0% 50%, 25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%);   
}

The inset attribute of clip-path is applied

<img  class="clip-me lazy"  src="/static/imghwm/default1.png"  data-src="thing-to-be-clipped.png"    alt="Detailed explanation of how to use the clip-path area cropping attribute in CSS" >   
.clip-me {     
  /* 最新规范写法 (没有定位要求)， */
  clip-path: inset(10px 20px 30px 40px); /* or "none" */
  /* 值指的是 top, right, bottom, left 四个点 */
}

in There are four values ​​in the inset() function in the attribute value of clip-path, which respectively express the four points of top/left and bottom/right, and circle a rectangular area. The parts outside this rectangular area will be cropped and hidden.

Other properties of clip-path are applied

.clip-me {    

  /* 引用一个内联的 SVG <clipPath> 路径*/
  clip-path: url(#c1);    

  /* 引用一个外部的 SVG  路径*/
  clip-path: url(path.svg#c1);   

  /* 多边形 */
  clip-path: polygon(5% 5%, 100% 0%, 100% 75%, 75% 75%, 75% 100%, 50% 75%, 0% 75%);   

  /* 圆形 */
  clip-path: circle(30px at 35px 35px);   

  /* 椭圆 */
  clip-path: ellipse(65px 30px at 125px 40px);   

  /* inset-rectangle() 将会替代 inset() ? */
  /* rectangle() 有可能出现于 SVG 2 */

  /* 圆角 */
  clip-path: inset(10% 10% 10% 10% round 20%, 20%);   

}

SVG clipping path example:

<clipPath id="clipping">   
  <circle cx="150" cy="150" r="50" />   
  <rect x="150" y="150" width="100" height="100" />   
</clipPath>

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