code-share/pixel-loading.html at main · hmpstrplpolmed/code-share · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      .wrapper {
        display: grid;
        grid-template-columns: repeat(4, 2rem);
        grid-template-rows: repeat(4, 2rem);
        padding: 0.125rem;
        width: fit-content;
        margin: 2rem auto;
      }
      .box {
        background-color: #fff;
      }
      .fill {
        transition: background-color 0.5s ease;
      }
      .fill.black {
        background-color: #000;
      }
    </style>
  </head>
  <body>
    <div class="wrapper">
      <div class="box box-1"></div>
      <div class="box box-2 fill" data-order="1"></div>
      <div class="box box-3 fill" data-order="2"></div>
      <div class="box box-4"></div>
      <div class="box box-5 fill" data-order="8"></div>
      <div class="box box-6"></div>
      <div class="box box-7"></div>
      <div class="box box-8 fill" data-order="3"></div>
      <div class="box box-9 fill" data-order="7"></div>
      <div class="box box-10"></div>
      <div class="box box-11"></div>
      <div class="box box-12 fill" data-order="4"></div>
      <div class="box box-13"></div>
      <div class="box box-14 fill" data-order="6"></div>
      <div class="box box-15 fill" data-order="5"></div>
      <div class="box box-16"></div>
    </div>
    <script>
      const fills = []
      for (let num = 1; num <= 8; num++) {
        const element = document.querySelector(`[data-order="${num}"]`)
        if (element) {
          fills.push(element)
        }
      }
      const delayBetweenElements = 200
      const activeDuration = 400
      const intervalDuration = 1600
      fills.forEach((el, i) => {
        setTimeout(() => {
          el.classList.add('black')
          setTimeout(() => {
            el.classList.remove('black')
          }, activeDuration)
        }, delayBetweenElements * i)
      })
      setInterval(() => {
        fills.forEach((el, i) => {
          setTimeout(() => {
            el.classList.add('black')
            setTimeout(() => {
              el.classList.remove('black')
            }, activeDuration)
          }, delayBetweenElements * i)
        })
      }, intervalDuration)
    </script>
  </body>
</html>