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HTML 

              
                mixin avatar(name, status)
  .avatar(class=((status ? "status " + status : "")))
    img(src=`https://api.dicebear.com/9.x/bottts-neutral/svg?seed=${name}&rotate=350&backgroundType=solid,gradientLinear&backgroundRotation=360,10,20,30,280,270,180,190,200,320,310,300,290,330,340,350,210,220,230,250,260,240,170,160,150,140,130,120,110,100,90,80,70,60,50,40,0&randomizeIds=true`)

main
    form.dark
    
        h1 <span>CSS</span> MASK <span>&amp;</span> TRIGONOMETRY
        h2 for avatar status indicators
    
    
    
    
        #app
            .resizer
                +avatar("inky", "offline")
                +avatar("blinky", "online")
                +avatar("pinky", "idle")
                +avatar("clyde", "dnd")
                +avatar("Pacman", "")
                
                .bg
                









        #controls
            .field#angle
                label
                    code --status-angle
                    em 125deg
                .range
                    input(type="range",min=0,max=360,value=125)
            .field#size
                label
                    code --status-size
                    em 20px
                .range
                    input(type="range",min=5,max=50,value=20)
            .field#offset
                label
                    code --status-offset
                    em 0px
                .range
                    input(type="range",min=-20,max=20,value=0)
            .field#gap
                label
                    code --status-gap
                    em 0px
                .range
                    input(type="range",min=0,max=20,value=5)
                    
        
        .field#unit
            label
                | unit
            .group
                label px
                input.toggle.dual(type="checkbox")
                label %


        p demonstrating the indicators stick to the circumference of the avatar, without any explicit <code>h/w/x/y</code> values being set.




























// social icons
a.social-icon.codepen(href="https://codepen.io/simeydotme" title="view my codepens")
  | Made by Simey

a.social-icon.twitter(href="https://twitter.com/simeydotme")
  svg(viewBox="0 0 24 24")
    path(stroke="none" d="M0 0h24v24H0z" fill="none")
    path(d="M22 4.01c-1 .49 -1.98 .689 -3 .99c-1.121 -1.265 -2.783 -1.335 -4.38 -.737s-2.643 2.06 -2.62 3.737v1c-3.245 .083 -6.135 -1.395 -8 -4c0 0 -4.182 7.433 4 11c-1.872 1.247 -3.739 2.088 -6 2c3.308 1.803 6.913 2.423 10.034 1.517c3.58 -1.04 6.522 -3.723 7.651 -7.742a13.84 13.84 0 0 0 .497 -3.753c-.002 -.249 1.51 -2.772 1.818 -4.013z")

a.social-icon.github(href="https://github.com/simeydotme")
  svg(viewBox="0 0 24 24")
    path(stroke="none" d="M0 0h24v24H0z" fill="none")
    path(d="M9 19c-4.3 1.4 -4.3 -2.5 -6 -3m12 5v-3.5c0 -1 .1 -1.4 -.5 -2c2.8 -.3 5.5 -1.4 5.5 -6a4.6 4.6 0 0 0 -1.3 -3.2a4.2 4.2 0 0 0 -.1 -3.2s-1.1 -.3 -3.5 1.3a12.3 12.3 0 0 0 -6.2 0c-2.4 -1.6 -3.5 -1.3 -3.5 -1.3a4.2 4.2 0 0 0 -.1 3.2a4.6 4.6 0 0 0 -1.3 3.2c0 4.6 2.7 5.7 5.5 6c-.6 .6 -.6 1.2 -.5 2v3.5")
!

CSS 

              
                :root {
    
    /* demo vars for controlling */
    
    --status-size: 20px; /* size of the status */
    --status-gap: 5px; /* size of the gap around the status */
    --status-offset: 0px; /* how far from the circumference to offset the status */
    --status-angle: 120deg; /* where on the edge we want the status */
}

.avatar {
    
    /* necessary vars for calculating position/size */

    --d: calc(var(--status-size) + (var(--status-gap) * 2));             /* diameter of the mask */
    --r: calc((100% / 2) + var(--status-offset));                        /* distance from edge of avatar */
    --x: calc(var(--r) * cos(var(--status-angle) - 90deg) + (100% / 2)); /* x coord of status/mask */
    --y: calc(var(--r) * sin(var(--status-angle) - 90deg) + (100% / 2)); /* y coord of status/mask */
    
    /* colors */
    
    --color-offline: slategrey;
    --color-online:  rgb(0, 255, 135);
    --color-idle: rgb(255, 185, 51);
    --color-dnd: rgb(255, 40, 80);
    
    position: relative;
    
    &.status {
        &::after {
            content: "";
            aspect-ratio: 1;
            background: var(--color-offline);
            border-radius: 100%;
            position: absolute;
            width: var(--status-size);
            top: calc(var(--y) - (var(--status-size)/2));
            left: calc(var(--x) - (var(--status-size)/2));
        }
        
        & > * {
            
            /* create the cutout mask around the image,
              it's just a radial gradient positioned at the same place as the
              psuedo-element ::after */

            mask-image: radial-gradient(var(--d) var(--d) at var(--x) var(--y), transparent calc(50% - 0.5px), black calc(50% + 0.5px));
        
        }
        
        &.online&::after {
            background-color: var(--color-online);
        }
        &.idle&::after {
            background-color: var(--color-idle);
        }
        &.dnd&::after {
            background-color: var(--color-dnd);
        }
        
        /* 
            these next styles are just extra, not needed if you
            just want the color circles 
        */
        
        &.idle&::after {
            /* extra mask for idle 'moon' effect */
            mask-image: radial-gradient(90% 100% at 90% 30%, transparent calc(50% - 0.5px), black calc(50% + 0.5px));
        }
        &.dnd&::before {
            /* this is all a bit extra for the 'dnd' style */
            content: "";
            position: absolute;
            top: calc(var(--y) );
            left: calc(var(--x) );
            width: calc(var(--status-size) * 0.8);
            translate: -50% -50%;
            rotate: -9deg;
            aspect-ratio: 4/1;
            border-radius: 100vmax;
            background: hsl(349deg, 90%, 80% );
            background: color-mix(in oklch, var(--color-dnd), white 50%);
            z-index: 1;
        }
    }
}





/** demo specific css */

.avatar {

    height: 100%;
    aspect-ratio: 1;
    flex-shrink: 0;
    z-index: 1;
    
    & img {
        display: block;
        width: 100%;
        aspect-ratio: 1;
        object-fit: cover;
        border-radius: 100%;
        filter: grayscale(0.9);
        transition: all 0.5s ease;
    }

}

#app {
    display: flex;
    place-content: center;
    align-items: center;
}
.resizer {
    display: flex;
    position: relative;
    gap: 20px;
    padding: 20px;
    place-content: center;
    align-items: center;
    overflow: hidden;
    height: 120px;
    resize: vertical;
    
    &:hover img {
        filter: grayscale(0);
    }
}

.bg {
    position: absolute;
    inset: 0;
    opacity: 0;
    background: repeating-linear-gradient(45deg, transparent 0px , hsla(var(--h),var(--s),66%,0.66) 0px 10px, transparent 10px 20px ) 20%;
    transition: all 5s ease;
}
.resizer:hover .bg {
    opacity: 1;
    transition-duration: 500ms;
}

html, body, main {
    height: 100%;
}
form {
    padding-block: 2em;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: max-content max-content 2fr 1fr;
    place-items: center;
    height: 100%;
}
#controls {
    display: flex;
    flex-wrap: wrap;
    place-content: center;
    gap: 1em;
}
.field {
    text-align: center;
    margin: 0!important;
    & label {
        width: 100%;
        display: flex;
        gap: 0.5em;
        align-items: center;
        justify-content: center;
    }
    & em {
        font-size: 0.875em;
        text-transform: lowercase;
        color: rgb(0, 255, 135);
        &::before {
            content: " ( ";
        }
        &::after {
            content: " )";
        }
    }
    & code {
        background: none;
        color: var(--fg);
    }
    & .range input {
        width: 100%;
    }
}

h1,h2 {
    margin:0;
    text-shadow: 0 1px 1px color-mix(in oklch, var(--bg), black);
}
h2 {
    font-weight: 200;
    font-style: italic;
    color: color-mix(in oklch, var(--fg) 60%, var(--bg));
}
h1 span {
    font-style: italic;
    color: color-mix(in oklch, var(--fg) 60%, var(--bg));
}

body {
    font-family: 'Asap Condensed', sans-serif;
    font-weight: 400;
}

h1, h2 {
    font-family: 'Amaranth', sans-serif;
}

code, pre {
    font-family: 'Kode mono', monospace;
}
code {
    display: inline-block;
    padding-inline: 0.4em;
    border-radius: 0.2em;
    background: color-mix(in oklch, var(--bg) 85%, black);
    color: color-mix(in oklch, var(--fg) 60%, var(--tint));
    font-size: 0.875em;
}
!

JS 

              
                /*

    javascript just for demo the values changing from slider
    not needed in final solution

*/

const appEl = document.querySelector("#app");
let unit = 'px';

const inputs = [
  { id: "size", property: "--status-size" },
  { id: "angle", property: "--status-angle", suffix: "deg" },
  { id: "offset", property: "--status-offset" },
  { id: "gap", property: "--status-gap" }
];

inputs.forEach(({ id, property, suffix }) => {
  const inputEl = document.querySelector(`#${id} input`);
  const labelEl = document.querySelector(`#${id} label`);
  inputEl.addEventListener("input", (e) => {
    const value = e.target.value;
    appEl.style.setProperty(property, value + (suffix ?? unit));
    labelEl.querySelector("em").innerText = value + (suffix ?? unit);
  });
});

const unitEl = document.querySelector("#unit input");
const unitLabel = document.querySelector("#unit label");
unitEl.addEventListener("input", (e) => {
  unit = e.target.checked ? "%" : "px";
  inputs.forEach(({ id }) => {
    const inputEl = document.querySelector(`#${id} input`);
    inputEl.dispatchEvent(new Event("input", { bubbles: true }));
  });
});
!
999px

Console