animation-bugs/fixed-in-transformed-layer.html at master · harttle/animation-bugs · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width">
  <title></title>
  <style>
html, body {
  margin: 0;
  padding: 0;
  background: black;
}
.fixed {
  position: fixed;
}
#outer {
  background: yellow;
  position: relative;
  top: 30px;
  height: 300px;
  overflow-y: auto;
}
#inner {
  color: white;
  background: blue;
  top: 60px;
  left: 60px;
  right: 60px;
  bottom: 60px;
}
#toggle-translate0 {
  float :right;
}
.translate0 {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}
.translate0::before {
  content: 'translate3d(0,0,0)';
}
  </style>
</head>
<body>
  <div class="" id="outer">
    <button id="toggle-translate0">Toggle</button>
    Outer &lt;div&gt;
    <p>1</p>
    <p>2</p>
    <p>3</p>
    <p>4</p>
    <p>5</p>
    <p>6</p>
    <p>7</p>
    <p>8</p>
    <p>9</p>
    <p>10</p>
    <div class="fixed" id="inner">
      Fixed: top/left: 60px
    </div>
  </div>
  <script>
var inner = document.querySelector('#inner')
var outer = document.querySelector('#outer')
document.querySelector('#toggle-translate0').addEventListener('click', function () {
  var cls =  /translate0/.test(outer.getAttribute('class')) ? '' : 'translate0'
  outer.setAttribute('class', cls)
})
  </script>
</body>
</html>