How Can I Create Partial Borders in CSS?

Partial Borders in CSS: A Creative Illusion

It can be desirable to create boxes with borders that appear only on certain sides or extend only partially across an edge. Despite the absence of direct support in CSS, this effect can be elegantly achieved through a simple and flexible method.

Consider, for instance, a box of 350px width with a bottom border that extends only 60px from the left. This can be replicated with the following CSS code:

div {
  width: 350px;
  height: 100px;
  background: lightgray;
  position: relative;
  margin: 20px;
}

div:after {
  content: '';
  width: 60px;
  height: 4px;
  background: gray;
  position: absolute;
  bottom: -4px;
}

The magic lies in the div:after pseudo-element. It creates an empty box positioned absolutely at the bottom of the main box. By adjusting the width and bottom properties, we can control the size and position of the partial border.

This approach is versatile and works well in all modern browsers. It does not require any additional markup, leading to clean and maintainable code. It also degrades gracefully in browsers that do not support position: absolute.

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