How do you remove a section of an element's box model?

Question

How do you remove a section of an element's box model?

Query:

I am trying to achieve a half circle effect by removing a portion of the circle element's box model. Can this be done and if so, how can I accomplish it? Creating complex shapes would become much easier with this functionality.

Strategy:

To create a half circle effect, I started by creating a square div and applying border-radius: 100% to round the corners. Then, I used

clip-path: polygon(0% 50%, 100% 50%, 100% 100%, 0% 100%)

to control the shape of the div, along with aspect-ratio: 1/1 to maintain its proportions. However, I found that the clip-path property only hides part of the div instead of removing its box model entirely.

Visual Example:

https://i.sstatic.net/COAi3.png

Sample Code Snippet:

.half_circle {
    background: red;
    height: 100px;
    width: 100px;
    border-radius: 100%;
    clip-path: polygon(0% 50%, 100% 50%, 100% 100%, 0% 100%);
    aspect-ratio: 1/1;
}

html css

Answer 1

Answer №1

Create a unique design using an absolutely-positioned pseudo-element.

.half-circle {
  height: 50px;
  width: 100px;
  border: 3px solid cyan;
  position: relative;
}
.half-circle::before {
  content: '';
  background: red;
  position: absolute;
  top: -50px;
  left: 0;
  width: 100px;
  height: 100px;
  border-radius: 100%;
  clip-path: polygon(0% 50%, 100% 50%, 100% 100%, 0% 100%);
}

<div class="half-circle"></div>

For added effect, consider adding overflow: hidden to the .half-circle class to remove the need for clip-path.

.half-circle {
  height: 50px;
  width: 100px;
  border: 3px solid cyan;
  position: relative;
  overflow: hidden;
}
.half-circle::before {
  content: '';
  background: red;
  position: absolute;
  top: -50px;
  left: 0;
  width: 100px;
  height: 100px;
  border-radius: 100%;
}

<div class= "half-circle"></div>

Answer 2

Create a unique design using an absolutely-positioned pseudo-element.

.half-circle {
  height: 50px;
  width: 100px;
  border: 3px solid cyan;
  position: relative;
}
.half-circle::before {
  content: '';
  background: red;
  position: absolute;
  top: -50px;
  left: 0;
  width: 100px;
  height: 100px;
  border-radius: 100%;
  clip-path: polygon(0% 50%, 100% 50%, 100% 100%, 0% 100%);
}

<div class="half-circle"></div>

For added effect, consider adding overflow: hidden to the .half-circle class to remove the need for clip-path.

.half-circle {
  height: 50px;
  width: 100px;
  border: 3px solid cyan;
  position: relative;
  overflow: hidden;
}
.half-circle::before {
  content: '';
  background: red;
  position: absolute;
  top: -50px;
  left: 0;
  width: 100px;
  height: 100px;
  border-radius: 100%;
}

<div class= "half-circle"></div>

How do you remove a section of an element's box model?

Answer №1

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