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+<!DOCTYPE html>
+<html reftest-async-scroll>
+<head>
+ <style>
+ * {
+ scrollbar-width: none;
+ }
+ body {
+ margin: 0;
+ }
+ #scroller {
+ overflow: auto;
+ width: 400px;
+ height: 400px;
+ }
+ #content {
+ top: 0px;
+ width: 200px;
+ height: 200px;
+ background: green;
+ }
+ #spacer {
+ height: 2000px;
+ }
+ </style>
+</head>
+<body >
+ <!-- Test that an overscroll past one end of a viewport is rendered
+ as having the content create a gutter, and that
+ the overscroll is reduced by some factor such that
+ a 100px scroll must produce a rendered translation of less than
+ 100px.
+
+ Current overscroll physics mean that an instantaneous overscroll
+ by 200px produces an 8px gutter. This is governed by the logic in
+ Axis::ApplyResistance(); if that logic is changed, this test will
+ need to be modified to account for the new result.
+ -->
+ <div id="scroller"
+ reftest-displayport-x="0" reftest-displayport-y="0"
+ reftest-displayport-w="800" reftest-displayport-h="2000"
+ reftest-async-scroll-x="0" reftest-async-scroll-y="-200">
+ <div id="content"></div>
+ <div id="spacer"></div>
+ </div>
+</body>
+</html>