fractional-scroll-area-invalidation.html

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<!DOCTYPE html>

<html lang="en" reftest-async-scroll>

<meta charset="utf-8">

<title>Make sure the scrolled layer is not invalidated when you scroll all the way to the bottom</title>

<style>

body {

  margin: 0;

.scrollbox {

  margin: 50px;

  width: 200px;

  height: 200px;

  overflow: auto;

.scrolled-contents {

  height: 150.2px;

  padding-top: 150px;

.reftest-no-paint {

  margin: 0 20px;

  border: 1px solid blue;

  height: 25px;

</style>

<body>

<div class="scrollbox"

     reftest-displayport-x="0" reftest-displayport-y="0"

     reftest-displayport-w="200" reftest-displayport-h="200"

     reftest-async-scroll-x="0" reftest-async-scroll-y="0">

  <div class="scrolled-contents">

    <div class="reftest-no-paint">

      <!-- This element has the magic "reftest-no-paint" class which

           constitutes the actual test here. -->

    </div>

  </div>

</div>

<script>

var scrollbox = document.querySelector(".scrollbox");

scrollbox.scrollTop = 2;

scrollbox.scrollTop = 1;

scrollbox.scrollTop = 0;

function doTest() {

  scrollbox.scrollTop = 999;

  document.documentElement.removeAttribute("class");

document.addEventListener("MozReftestInvalidate", doTest);

</script>