File: position-sticky-root-scroller.html

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<!DOCTYPE html>
<title>position:sticky should operate correctly for the root scroller</title>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that position:sticky elements work when using the root (document) scroller" />

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
body {
  /* Assumption: 3000px is taller than any user agents test window size. */
  height: 3000px;
}

#sticky {
  position: sticky;
  top: 50px;
  width: 200px;
  height: 200px;
  background-color: green;
}
</style>

<div id="sticky"></div>

<script>
test(() => {
  window.scrollTo(0, 700);
  assert_equals(sticky.offsetTop, 700 + 50);
}, 'Sticky elements work with the root (document) scroller');
</script>