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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, false);
+
+</script>