<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
   - http://creativecommons.org/publicdomain/zero/1.0/ -->
<!-- Percentage sticky offsets should be computed correctly when
   - the scroll container is auto-sized -->
<html>
  <head>
    <link rel="author" title="Corey Ford" href="mailto:cford@mozilla.com">
    <link rel="match" href="scrollframe-auto-1-ref.html">
    <style>
      body {
        /* even on initial reflow */
        overflow: scroll;
      }
      #scroll {
        height: auto;
        overflow: hidden;
        border: 1px solid black;
      }
      #sticky {
        position: sticky;
        height: 10px;
        top: 50%;
        background-color: black;
      }
      .fill {
        height: 200px;
      }
    </style>
  <body>
    <div id="scroll">
      <div id="sticky"></div>
      <div class="fill"></div>
    </div>
  </body>
</html>