File: overscroll-subframe.html

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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>