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<!DOCTYPE html>
<html lang="en" class="reftest-wait"
      reftest-displayport-x="0"
      reftest-displayport-y="0"
      reftest-displayport-w="800"
      reftest-displayport-h="1000">
<meta charset="utf-8">
<title>Scrolling shouldn't invalidate the fixed layer</title>

<style>

.content {
  box-sizing: border-box;
  width: 200px;
  height: 200px;
  border: 1px solid black;
}

.fixed {
  position: fixed;
  top: 20px;
  left: 20px;
}

.reftest-no-paint {
  border-color: lime;
}

.distanceFromTop {
  margin-top: 240px;
}

body {
  margin: 0;
  padding: 20px;
  height: 3000px;
}


</style>

<div class="distanceFromTop content">
  <!--
    This is just a non-uniform item that will be scrolled so that it's between
    the page background and the fixed layer.
  -->
</div>

<div class="fixed reftest-no-paint content">
  <!--
    This fixed layer gets its own PaintedLayer above the page.

    It shouldn't attempt to pull up an opaque background color from the page,
    because the page can move under it.
  -->
</div>

<script>

function doTest() {
  document.documentElement.scrollTop = 100;
  document.documentElement.removeAttribute("class");
}
document.documentElement.scrollTop = 0;
document.addEventListener("MozReftestInvalidate", doTest);

</script>