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+<!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>
+