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+<!DOCTYPE html>
+<html lang="en" class="reftest-wait">
+<meta charset="utf-8">
+<title>Starting to scroll the nested scrollbox 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: 240px;
+}
+
+.reftest-no-paint {
+ border-color: lime;
+}
+
+.scrollable {
+ overflow: auto;
+ padding: 10px;
+}
+
+.scrolled {
+ border: 1px solid gray;
+ height: 400px;
+}
+
+body {
+ margin: 0;
+ padding: 20px;
+ height: 3000px;
+}
+
+</style>
+
+<div class="scrollable content" id="aboutToScroll">
+ <!--
+ This scrollbox starts out without active scrolling and is going to become
+ actively scrolled.
+ -->
+ <div class="scrolled"></div>
+</div>
+
+<div class="fixed reftest-no-paint content">
+ <!--
+ This fixed layer gets its own PaintedLayer above the rest.
+ When the contents of .scrollable require their own PaintedLayer, that
+ should not cause .fixed to change layers.
+ -->
+</div>
+
+<script>
+
+function doTest() {
+ document.querySelector("#aboutToScroll").scrollTop = 50 - document.querySelector("#aboutToScroll").scrollTop;
+ document.documentElement.removeAttribute("class");
+}
+document.addEventListener("MozReftestInvalidate", doTest);
+
+</script>