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+<!DOCTYPE html>
+<html lang="en" reftest-async-scroll>
+<meta charset="utf-8">
+<title>Make sure the scrolled layer is opaque even if the scrolled area is fractional</title>
+
+<style>
+
+body {
+ margin: 0;
+}
+
+.scrollbox {
+ margin: 50px;
+ width: 200px;
+ height: 200px;
+ overflow: auto;
+
+ /* Make the background "non-uniform" so that the scrolled layer does not
+ * pull up a background color. */
+ background: linear-gradient(to bottom, white, transparent);
+}
+
+.scrolled-contents {
+ height: 300.2px;
+ background-color: lime;
+ box-sizing: border-box;
+ border: 1px solid lime;
+}
+
+.transparent-overlap-of-fractional-edge {
+ margin: -10px 20px 0;
+ height: 40px;
+ background-color: rgba(0, 0, 255, 0.5);
+}
+
+</style>
+
+<body>
+
+<div class="scrollbox"
+ reftest-displayport-x="0" reftest-displayport-y="-100.2"
+ reftest-displayport-w="200" reftest-displayport-h="300.2"
+ reftest-async-scroll-x="0" reftest-async-scroll-y="0">
+ <div class="scrolled-contents">
+ <div class="transparent-overlap-of-fractional-edge reftest-opaque-layer">
+ <!-- This element has the magic "reftest-opaque-layer" class which
+ constitutes the actual test here. -->
+ </div>
+ </div>
+</div>
+
+<script>
+
+document.querySelector(".scrollbox").scrollTop = 100000; /* will end up at 100.2 */
+
+</script>