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CSS

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HTML 

              
                <div class="info">
  <div class="info__scroll">
    <label for="scroll-height">
      <i class="bi bi-arrow-down-up"></i>
      <input name="scroll-height" type="text" id="scroll-height" disabled>
    </label>
    <label for="scroll-top">
      <i class="bi bi-arrow-bar-down"></i>
      <input name="scroll-top" type="text" id="scroll-top" disabled>
    </label>
  </div>
  <div class="info__win-state">
    <label for="win-state">
      <i class="bi bi-broadcast"></i>
      <input name="win-state" type="text" id="win-state" disabled>
    </label>
    <label for="coord-client">
      <i class="bi bi-mouse2"></i>
      <input name="coord-client" type="text" id="coord-client" disabled>
    </label>
    <label for="coord-page">
      <i class="bi bi-arrow-bar-up"></i>
      <input name="coord-page" type="text" id="coord-page" disabled>
    </label>
  </div>
  <div class="info__client-size">
    <label for="client-size">
      <i class="bi bi-aspect-ratio"></i>
      <input name="client-size" type="text" id="client-size" disabled>
    </label>
  </div>
</div>

<div id="ruler">
  <template>
    <div class="ruler">
      <div class="unit"></div>
      <ul>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
      </ul>
    </div>
  </template>
</div>

<div id="click-target">
  <template>
    <div class="click" style="--size: 1.5rem; --x: 0; --y: 0">
      
    </div>
  </template>
</div>
!

CSS 

              
                :root {
  --camel: #f5e4bc;
  --camel-rgb: 245,228,188;
  --camel-dark: #f2dba6;
  --camel-dark-rgb: 242,219,166;
  --camel-darker: #ecc979;
  --camel-darker-rgb: 236,201,121;
  --camel-light: #f9edd2;
  --camel-light-rgb: 249,237,210;
  --brown: #292823;
  --brown-rgb: 41,40,35;
  --brown-dark: #0e0d0c;
  --brown-dark-rgb: 14,13,12;
  --brown-light: #45433b;
  --brown-light-rgb: 69,67,59;
  --accent: hotpink;
  --scrollY: 0;
  --blur: 0;
  --client-x: 0;
  --client-y: 0;
}

// scrollbar styles
::-webkit-scrollbar {
  width: 8px;
  height: 5px;
}
::-webkit-scrollbar-thumb {
  background: var(--brown);
  border-radius: 5px;
}
::-webkit-scrollbar-track-piece {
  background-color: var(--camel);
}

body {
  position: relative;
  font-family: monospace;
  font-size: 1.5rem;
  color: var(--brown);
  background-color: var(--camel);
  //background-image: linear-gradient(180deg, rgba(255,255,255,.5) 0%, rgba(255,255,255,0) 100%);
  //background-blend-mode: overlay;
  background-attachment: fixed;
}

 input {
   width: 100%;
   border: 0;
   color: unset;
   background: unset;
   text-align: center;
   font-size: 85%;
}

@mixin unit($color, $width, $height) {
  position: relative;
  &::before {
      content: "";
      position: absolute;
      top: 0;
      height: $height;
      width: $width;
      background: $color;
    }
    &::after {
      content: "";
      position: absolute;
      bottom: 0;
      height: $height;
      width: $width;
      background: $color;
    }
}

.ruler {
  position: relative;
  .unit {
    position: absolute;
    z-index: 1;
    pointer-events: none;
    bottom: .5rem;
    left: 2rem;
    font-size: 0.8rem;
    color: var(--brown-light);
  }
  ul {
    height: 100px;
    @include unit(var(--accent), 2.5rem, 1px);
    &::before {
      z-index: 1;
    }
    li {
      position: above;
      height: 10px;
      @include unit(#b59d6e, 1.5rem, 1px);
      &:nth-child(2n) {
        background: rgb(255 255 255 / .18)
      }
      &:hover {
        background: var(--camel-dark)
      }
    }
  }
}

.info {
  position: fixed;
  z-index: 2;
  pointer-events: none;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-flow: column;
  
  label {
    position: relative;
    display: flex;
    gap: .5rem;
  }

  [class^='info__'] {
    width: 185px;
    background: var(--camel-dark);
    border-radius: 5px;
    box-shadow: 0px 1px 0 0 var(--camel-dark), 2px 2px 8px -2px rgb(0 0 0 / 30%);
    //border: 1px solid var(--camel-dark);
    padding: 0.5rem 1rem;
    display: flex;
    flex-flow: row wrap;
    gap: 1rem;
  }
}

.mouse {
  position: fixed;
  z-index: 3;
  pointer-events: none;
  top: calc(1px * var(--client-y) + 15px);
  left:  calc(1px * var(--client-x) + 5px);
  transition: top 0.3s linear, left 0.3s linear;
  width: 90px;
  height: 90px;
  background: var(--camel-dark);
  box-shadow: 4px 4px 4px -2px rgb(0 0 0 / 30%);
  border-radius: 50%;
  
  & * { cursor: none !important; }
  
  .mouse__coord {
    display: flex;
    flex-flow: column;
    height: 100%;
    justify-content: center;
    align-items: center;
    font-size: .8rem;
    
  }
}

#click-target {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
  .click {
    position: absolute;
    top: calc(1px * var(--y) - var(--size) / 2);
    left: calc(1px * var(--x) - var(--size) / 2);
    font-size: var(--size);
  }
}
!

JS 

              
                const win = window
const root = document.documentElement;


/**
 * build ruler
 */
const ruler = document.getElementById('ruler')
const rulerTmp = ruler.querySelector('template')

for(let i = 0; i < 18; i++) {
  const clone = rulerTmp.content.cloneNode(true)
  const unit = clone.querySelector('.unit')
  unit.innerText = `${(i+1)*100}px`
  ruler.appendChild(clone)
}


/**
 * mouse click event
 */
const clickTarget = document.getElementById('click-target')
const clickTargetTmp = clickTarget.querySelector('template')
win.onclick = _.debounce(clickHandler, 100);

function clickHandler(e) {
  const clone = clickTargetTmp.content.cloneNode(true)
  const click = clone.querySelector('.click')
  const emojis = ['😎','🥸','🤩','🥳','😏','🤮']
  click.style.setProperty("--x", e.pageX)
  click.style.setProperty("--y", e.pageY)
  click.innerText = emojis[Math.floor(Math.random() * emojis.length)]
  
  clickTarget.appendChild(clone)
}


/**
 * resize event
 */
const inputClientSize = document.getElementById('client-size')
win.onresize = _.debounce(resizeHandler, 300);

function resizeHandler() {
  inputClientSize.value =`${root.clientWidth}px x ${root.clientHeight}px`
}
 

/**
 * scroll event
 */
const inputScrollHeight = document.getElementById('scroll-height')
const inputScrollTop = document.getElementById('scroll-top')
win.onscroll = _.throttle(scrollHandler, 300);

function scrollHandler(e) {
  inputScrollHeight.value =`${root.scrollHeight}px`
  inputScrollTop.value =`${root.scrollTop}px`
}


/**
 * document events
 */
const inputWinState = document.getElementById('win-state')
win.onload = ()=>winStateHandler('loaded')
win.onfocus = ()=>winStateHandler('focus')
win.onblur = ()=>winStateHandler('blur')

function winStateHandler(state) {
  inputWinState.value = state
}


/**
 * mouse move
 */
const inputCoordClient = document.getElementById('coord-client')
const inputCoordPage = document.getElementById('coord-page')
win.onmousemove = _.throttle(mouseMoveHandler, 200)

function mouseMoveHandler(e) {
  const clientX = e.clientX
  const clientY = e.clientY
  const pageX = e.pageX
  const pageY = e.pageY
  
  inputCoordClient.value = `${clientX}px / ${clientY}px`
  inputCoordPage.value = `${pageY}px`
  
  //root.style.setProperty("--client-x", clientX)
  //root.style.setProperty("--client-y", clientY)
}


/**
 * init
 */
scrollHandler()
resizeHandler()
!
999px

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