1 files changed, 54 insertions, 0 deletions
diff --git a/layout/reftests/bugs/1169331-1.html b/layout/reftests/bugs/1169331-1.html
new file mode 100644
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+++ b/layout/reftests/bugs/1169331-1.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html lang="en" class="reftest-wait">
+<meta charset="utf-8">
+<title>Rotated buffer with mask</title>
+
+<style>
+
+body {
+  margin: 0;
+}
+
+.outer {
+  overflow: hidden;
+  border-radius: 10px;
+  padding: 50px;
+}
+
+.scrollbox {
+  width: 200px;
+  height: 200px;
+  overflow: auto;
+}
+
+.scrolled {
+  box-sizing: border-box;
+  border: 1px solid transparent;
+  height: 200px;
+}
+
+</style>
+
+<div class="outer">
+
+  <div class="scrollbox">
+    <div class="scrolled" style="background-color: blue;"></div>
+    <div class="scrolled" style="background-color: lime;"></div>
+  </div>
+
+</div>
+
+<script>
+
+var scrollbox = document.querySelector(".scrollbox");
+
+scrollbox.scrollTop = 1;
+scrollbox.scrollTop = 0;
+
+window.addEventListener("MozReftestInvalidate", function (e) {
+  scrollbox.scrollTop = 199;
+  document.documentElement.removeAttribute("class");
+});
+
+</script>
+