css/css-will-change/will-change-transform-inline.html

<!doctype html>
<title>will-change: transform shouldn't create a containing block if the box doesn't support transforms</title>
<link rel=author href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel=author href="https://mozilla.org" title="Mozilla">
<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1707170">
<link rel=help href="https://drafts.csswg.org/css-will-change/#will-change">
<link rel=match href="will-change-transform-inline-ref.html">
<style>
  #container {
    will-change: transform;
  }
  #child {
    position: fixed;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    background-color: blue;
  }
</style>
<div style="height: 200px"></div>
<span id="container">
  Child should be positioned relative to the viewport, not relative to me.

  <div id="child"></div>
</span>