File: 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>