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+<!DOCTYPE html>
+<html lang="en" class="reftest-wait">
+<meta charset="utf-8">
+<title>Adding a new display item to the bottom of an existing PaintedLayer shouldn't cause the other items in that layer to change layers</title>
+
+<style>
+
+.content {
+ box-sizing: border-box;
+ width: 200px;
+ height: 200px;
+ border: 1px solid black;
+}
+
+.fixed {
+ position: fixed;
+ top: 20px;
+ left: 140px;
+}
+
+.onTopOfFixed {
+ position: absolute;
+ top: 120px;
+ left: 260px;
+}
+
+.reftest-no-paint {
+ border-color: lime;
+}
+
+#aboutToBecomeVisible {
+ left: 20px;
+}
+
+body {
+ margin: 0;
+ padding: 20px;
+ height: 3000px;
+}
+
+</style>
+
+<div class="fixed content">
+ <!--
+ This layer is just there to force .onTopOfFixed into a PaintedLayer above
+ the page background.
+ -->
+</div>
+
+<div class="onTopOfFixed content" id="aboutToBecomeVisible" style="visibility: hidden">
+ <!--
+ This item starts out invisible but should end up in the same layer as the other
+ .onTopOfFixed item, once it's visible.
+ -->
+</div>
+
+<div class="onTopOfFixed reftest-no-paint content">
+ <!--
+ This item shouldn't repaint when the other .onTopOfFixed item becomes visible.
+ -->
+</div>
+
+<script>
+
+function doTest() {
+ document.querySelector("#aboutToBecomeVisible").style.visibility = "visible";
+ document.documentElement.removeAttribute("class");
+}
+document.addEventListener("MozReftestInvalidate", doTest);
+
+</script>