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+<!DOCTYPE html>
+<html lang="en" class="reftest-wait" reftest-async-scroll>
+<meta charset="utf-8">
+<title>Bug 1164227 - Testcase for the invalid region simplification bug</title>
+
+<style>
+
+#scrollbox {
+ width: 400px;
+ height: 500px;
+ overflow: auto;
+ margin: 80px;
+ border: 1px solid black;
+}
+
+.contents {
+ height: 600px;
+ background: white;
+ padding: 20px;
+ position: relative;
+}
+
+.boxes > div {
+ box-sizing: border-box;
+ width: 10px;
+ height: 10px;
+ border: 1px solid black;
+ float: left;
+ margin-left: -2px;
+}
+
+.boxes > div:nth-child(odd) {
+ transform: translateY(500px);
+}
+
+.reftest-no-paint {
+ position: absolute;
+ top: 250px;
+ left: 30px;
+ width: 200px;
+ height: 50px;
+ border: 1px solid red;
+}
+</style>
+
+<div id="scrollbox"
+ reftest-displayport-x="0"
+ reftest-displayport-y="0"
+ reftest-displayport-w="400"
+ reftest-displayport-h="500">
+
+ <div class="contents">
+
+ <div class="boxes">
+ <div style="margin-top: 0px"></div>
+ <div style="margin-top: 1px"></div>
+ <div style="margin-top: 2px"></div>
+ <div style="margin-top: 3px"></div>
+ <div style="margin-top: 4px"></div>
+ <div style="margin-top: 5px"></div>
+ <div style="margin-top: 6px"></div>
+ <div style="margin-top: 7px"></div>
+ <div style="margin-top: 8px"></div>
+ <div style="margin-top: 9px"></div>
+ <div style="margin-top: 10px"></div>
+ <div style="margin-top: 11px"></div>
+ <div style="margin-top: 12px"></div>
+ <div style="margin-top: 13px"></div>
+ <div style="margin-top: 14px"></div>
+ <div style="margin-top: 15px"></div>
+ <div style="margin-top: 16px"></div>
+ <div style="margin-top: 17px"></div>
+ <div style="margin-top: 18px"></div>
+ <div style="margin-top: 19px"></div>
+ <div style="margin-top: 20px"></div>
+ <div style="margin-top: 21px"></div>
+ <div style="margin-top: 22px"></div>
+ <div style="margin-top: 23px"></div>
+ <div style="margin-top: 24px"></div>
+ <div style="margin-top: 25px"></div>
+ <div style="margin-top: 26px"></div>
+ <div style="margin-top: 27px"></div>
+ <div style="margin-top: 28px"></div>
+ <div style="margin-top: 29px"></div>
+ <div style="margin-top: 30px"></div>
+ <div style="margin-top: 31px"></div>
+ <div style="margin-top: 32px"></div>
+ <div style="margin-top: 33px"></div>
+ <div style="margin-top: 34px"></div>
+ <div style="margin-top: 35px"></div>
+ <div style="margin-top: 36px"></div>
+ <div style="margin-top: 37px"></div>
+ <div style="margin-top: 38px"></div>
+ <div style="margin-top: 39px"></div>
+ </div>
+
+ <div class="reftest-no-paint"></div>
+
+ </div>
+
+</div>
+
+<script>
+
+var scrollbox = document.querySelector("#scrollbox");
+scrollbox.scrollTop = 100;
+
+window.addEventListener("MozReftestInvalidate", function (e) {
+ scrollbox.scrollTop = 0;
+ document.documentElement.removeAttribute("class");
+});
+
+</script>