File: opt-out-table.html

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>

#scroller {
    height: 200px;
    overflow: scroll;
}
#before { height: 50px; }
#table {
    display: table;
    overflow-anchor: none;
    width: 100px;
    height: 100px;
    margin-bottom: 500px;
}

</style>
<div id="scroller">
    <div id="before"></div>
    <div id="table">content</div>
</div>
<script>

// Tests that the anchor exclusion API works with tables

test(() => {
  let scroller = document.querySelector('#scroller');
  let before = document.querySelector('#before');

  // Scroll down so that #table is the only element in view
  scroller.scrollTop = 50;

  // Expand #before so that we might perform a scroll adjustment
  before.style.height = "100px";

  // We shouldn't have selected #table as an anchor as it is
  // 'overflow-anchor: none'
  assert_equals(scroller.scrollTop, 50);
}, "A table with 'overflow-anchor: none' shouldn't generate any scroll anchor candidates.");

</script>