CSS3：border-image

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
</head>

<body>
  <p>原始图片</p>
  <img src="./images/border1.png" alt="">
  <p>一、</p>
  <p>border: 27px solid transparent;</p>
  <p>border-image-source: url(./images/border1.png);</p>
  <div class="border-image1"></div>

  <p>二、</p>
  <p>border: 27px solid transparent;</p>
  <p>border-image-source: url(./images/border1.png);</p>
  <p>border-image-slice: 27 27 27 27;</p>
  <p>border-image-repeat: stretch;（图像边界默认拉伸）</p>
  <div class="border-image2"></div>

  <p>三、</p>
  <p>border: 27px solid transparent;</p>
  <p>border-image-source: url(./images/border1.png);</p>
  <p>border-image-slice: 27;</p>
  <p>border-image-repeat: repeat;（图像边界重复）</p>
  <div class="border-image3"></div>

  <p>四、</p>
  <p>border: 27px solid transparent;</p>
  <p>border-image-source: url(./images/border1.png);</p>
  <p>border-image-slice: 27;</p>
  <p>border-image-repeat: round;（图像边界铺满）</p>
  <div class="border-image4"></div>

  <p>五、</p>
  <p>border: 10px solid transparent;</p>
  <p>border-image: url(./images/border1.png) 27 round;</p>
  <div class="border-image5"></div>
  <p>原始图片</p>
  <img src="./images/border2.png" alt="">

  <p>六、</p>
  <div>border: 64px solid transparent;</div>
  <div> border-image-source: url(./images/border2.png);</div>
  <div>border-image-slice: 64;</div>
  <div class="border-image6"></div>

  <p>七、相比于background-image，优势在于等比缩放时可以保证四个角的宽度不变</p>
  <div>border: 64px solid transparent;</div>
  <div> border-image-source: url(./images/border2.png);</div>
  <div>border-image-slice: 64 fill;（fill保留图像的中间部分）</div>
  <div class="border-image7"></div>
  <p>八、</p>
  <div>background-image: url(./images/border2.png);</div>
  <div>background-size: 100% 100%;</div>
  <div class="border-image8"></div>
</body>

</html>

<style>
  * {
    box-sizing: border-box;
  }

  .border-image1 {
    width: 300px;
    height: 150px;
    border: 27px solid transparent;
    border-image-source: url(./images/border1.png);
  }

  .border-image2 {
    width: 300px;
    height: 150px;
    border: 27px solid transparent;
    border-image-source: url(./images/border1.png);
    border-image-slice: 27 27 27 27;
  }

  .border-image3 {
    width: 300px;
    height: 150px;
    border: 27px solid transparent;
    border-image-source: url(./images/border1.png);
    border-image-slice: 27;
    border-image-repeat: repeat;
  }

  .border-image4 {
    width: 300px;
    height: 150px;
    border: 27px solid transparent;
    border-image-source: url(./images/border1.png);
    border-image-slice: 27;
    border-image-repeat: round;
  }

  .border-image5 {
    width: 300px;
    height: 150px;
    border: 10px solid transparent;
    border-image: url(./images/border1.png) 27 round;
  }

  .border-image6 {
    width: 468px;
    height: 232px;
    border: 64px solid transparent;
    border-image-source: url(./images/border2.png);
    border-image-slice: 64;
  }

  .border-image7 {
    width: 468px;
    height: 232px;
    border: 64px solid transparent;
    border-image-source: url(./images/border2.png);
    border-image-slice: 64 fill;
  }

  .border-image8 {
    width: 468px;
    height: 232px;
    background-image: url(./images/border2.png);
    background-size: 100% 100%;
  }
</style>