How to Create Circular Shapes with Partial Borders Using Only CSS in 2024?

Creating Circles with Partial Borders in HTML5/CSS3

When tasked with creating a circular shape with a partially visible border using HTML5/CSS3, the question arises if it's even possible. This article will explore various techniques to achieve this effect, focusing on the 2024 solution.

2024 Solution: A Cutting-Edge Approach

The 2024 solution operates without JavaScript, additional elements, or pseudo-elements. It solely relies on CSS declarations and performs exceptionally well even with semi-transparent backgrounds.

This innovative approach involves a double-layer mask:

• Layer 1 (Conic-Gradient Mask): This mask utilizes a conic-gradient relative to the border-box, revealing a customizable portion (controlled by --p) of the circle, starting from 12 o'clock in a clockwise direction.
• Layer 2 (Full Coverage Mask): This mask encompasses the entire area within the padding-box, ensuring that the border remains firmly within the circle's perimeter.

Code Snippet

The following code sample showcases the 2024 solution:

<code class="css">.circular-progress {
  border: solid 1.5em hotpink;
  width: 50vmin;
  aspect-ratio: 1;
  border-radius: 50%;
  background: hsla(180, 100%, 50%, .5);
  mask: 
    linear-gradient(red 0 0) padding-box, 
    conic-gradient(red var(--p, 17%), transparent 0%) border-box
}

/* To demonstrate compatibility with semi-transparent backgrounds */
body {
  background: 
    url(https://images.unsplash.com/photo-1693483923875-cdd9ef4a8046?w=800) 
      50%/ cover
}</code>

<code class="html"><div class='circular-progress'></div></code>

With this CSS code, you can now effortlessly create circular shapes with borders that are partially visible. The --p variable provides flexibility in controlling the visible portion of the border, making it a versatile solution for a range of design needs.

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