File: doc_mutations_fast.html

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <style>
    div {
      background-color: lime;
      height: 20px;
      opacity: 1;
      transition: 0.5s opacity;
    }

    .transition {
      opacity: 0;
    }
    </style>
  </head>
  <body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>

    <script>
    "use strict";

    // This function is called from test.
    // eslint-disable-next-line
    async function startFastMutations() {
      const targets = document.querySelectorAll("div");

      for (let i = 0; i < 10; i++) {
        for (const target of targets) {
          target.classList.toggle("transition");
          await wait(15);
        }
      }
    }

    async function wait(ms) {
      return new Promise(resolve => {
        setTimeout(resolve, ms);
      });
    }
    </script>
  </body>
</html>