<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Test (Overflow): body with overflow:hidden</title>
  <link rel="author" title="Chris Rebert" href="http://chrisrebert.com">
  <link rel="help" href="https://www.w3.org/TR/CSS2/visufx.html#overflow">
  <link rel="help" href="https://www.w3.org/TR/css-overflow-3/#overflow">
  <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#propdef-overflow">
  <meta name="flags" content="interact">
  <meta name="assert" content="position:fixed layer should not be able to cause scrolling of body styled as overflow:hidden">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
body {
  /* what we're testing */
  overflow: hidden;
}
h1 {
  /* bottom of #overlay-inner */
  position: absolute;
  bottom: 0;
  left: 0;
}
.margin-0 {
  /* remove extra space */
  margin: 0;
}
.tall {
  height: 100vh;
  width: 100%;
}
#bad {
  background-color: red;
}
#overlay {
  overflow: auto;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
#overlay-inner {
  position: relative;/* needed for the h1 */
  width: 60%;/* leave room for #bad to be visible */
  height: 150vh;/* force scroll */
  /* make this visually distinct */
  background-color: blue;
  color: white;
}
  </style>
</head>
<body class="margin-0">
  <div id="overlay">
    <div id="overlay-inner">
      <ol class="margin-0">
        <li>Scroll the blue square downward until you see the word "BOTTOM".</li>
        <li>End your scrolling action/gesture. (e.g. Remove your finger from the touchscreen.)</li>
        <li>Attempt to scroll the blue square further downward.</li>
        <li>If you see any red, then the test result is FAILED. Otherwise, it is PASSED.</li>
      </ol>
      <h1 class="margin-0">BOTTOM</h1>
    </div>
  </div>
  <div class="tall"></div>
  <div id="bad" class="tall"></div>
</body>
</html>
