How Can I Create Partial Borders in CSS for My Boxes?

Declaring Partial Borders for CSS Boxes

Creating a CSS box with a border that appears only on specific sections can enhance visual appeal and provide utility. While CSS doesn't explicitly allow for partial borders, there are effective workarounds to achieve this effect gracefully.

Partial Bottom Border

For a box that displays a border only at the bottom, apply the following styles:

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 div element creates the main box, while the div:after pseudo-element adds the bottom border. This technique degrades gracefully and doesn't require additional markup.

Multiple Partial Borders

To create multiple partial borders on the same box, use the border-image property with a sliced image as the source. This allows you to specify the position and dimensions of each border segment:

div {
  width: 350px;
  height: 100px;
  background: url('image.png') no-repeat;
}

div:after {
  content: '';
  width: 350px;
  height: 1px;
  border-bottom-width: 1px;
  border-bottom-style: solid;
  border-image: url('image.png') 60px 350px 5px 60px / 1px 1px;
}

In summary, while CSS doesn't natively support partial borders, these techniques provide effective solutions that degrade gracefully and offer flexibility in designing visually appealing box border treatments.

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