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+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+  <meta charset="utf-8">
+  <title>Testcase for bug 1504233</title>
+  <style type="text/css">
+    body {
+      margin: 0 0;
+    }
+
+    #wrapper {
+      display: flex;
+      flex-direction: column;
+      position: absolute;
+      width: 100%;
+      height: 100%;
+    }
+
+    #header {
+      background: blue;
+      flex: 0 0 200px;
+    }
+
+    #container {
+      overflow: scroll;
+      will-change: transform;
+      flex: 0 1 auto;
+      scrollbar-width: none;
+    }
+
+    #red {
+      background: red;
+      height: 200px;
+    }
+
+    #bg {
+      background: green;
+      height: 1500px;
+    }
+  </style>
+</head>
+<body>
+<div id="wrapper">
+  <div id="header"></div>
+  <div id="container">
+    <div id="red"></div>
+    <div id="bg"></div>
+  </div>
+</div>
+<script type="text/javascript">
+document.getElementById("container").scrollTop = 200;
+
+function doTest() {
+  var e = document.getElementById("header");
+  e.style.background = "green";
+  document.documentElement.removeAttribute("class");
+}
+
+window.addEventListener("MozReftestInvalidate", doTest);
+</script>
+</body>
+</html>