File: dynamic-toolbar-sticky-top-1.html

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<!DOCTYPE HTML>
<!--
  Tests that setting a fixed top margin in the compositor results
  in the margin being applied to an element sticky to the top.

  The fixed margin is specified as a test-pref in reftest.list.

  The purpose of the fixed margin is to compensate for the transform that the
  dynamic toolbar applies to the entire content area. We don't have a way of
  simulating that transform in a reftest, so the fixed margin in isolation will
  cause the fixed element to be offset from the top of the screen.
-->
<html>
<meta name="viewport" content="width=device-width">
<style>
html {
    scrollbar-width: none;
}
#scrolled {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;

    height: 2000px;
    width: 100%;
}
#sticky {
    width: 100%;
    height: 200px;
    position: sticky;
    top: 20px;
    background: red;
}
</style>
<body>
  <div id="scrolled">
    <div id="sticky"></div>
  </div>
</body>
</html>