position-fixed-in-scroll-container.html

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<!DOCTYPE html>

<html reftest-async-scroll>

<!-- In this test, the div |fixed| is fixed with respect to the

     page's root scroll frame, but there's also a subframe |scrollbox|

     which is async-scrolled and which generates a container layer

     (because of the opacity), so that its async transform is on an

     ancestor layer of |fixed|'s layer. We are testing that this

     async transform is correctly unapplied to keep |fixed| fixed. -->

<style>

body {

  height: 10000px;

.outer-opacity {

  opacity: 0.8;

.scrollbox {

  border: 1px solid black;

  width: 200px;

  height: 400px;

  overflow: scroll;

  scrollbar-width: none;

.inner-opacity {

  height: 1000px;

  opacity: 0.8;

.fixed {

  background: blue;

  width: 100px;

  height: 100px;

  position: fixed;

</style>

<div class="outer-opacity">

  <div class="scrollbox"

       reftest-displayport-x="0" reftest-displayport-y="0"

       reftest-displayport-w="200" reftest-displayport-h="1000"

       reftest-async-scroll-x="0" reftest-async-scroll-y="50">

    <div class="inner-opacity">

      <div class="fixed"></div>

    </div>

  </div>

</div>

</html>