abspos-in-multicol-001.html | Explore in Territory

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Oriol Brufau" href="mailto:[email protected]" />
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#candidate-examination">
<meta name="assert" content="The candidate examination algorithm iterates abspos descendants of the containing block. Being inside a fragmentainer shouldn't break that.">
<style>
html {
  column-count: 1; /* Fragmentainer */
}

body {
  position: relative; /* Containing block */
}

div {
  position: absolute; /* Abspos */
  font-size: 100px;
  width: 200px;
  height: 4000px;
  line-height: 100px;
}
</style>
<div>abc <b id=b>def</b> ghi</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// Tests anchoring to a text node that is moved by preceding text,
// everything in an absolutely positioned element whose containing block
// is inside a multi-column fragmentainer.

test(() => {
  var b = document.querySelector("#b");
  var preText = b.previousSibling;
  document.scrollingElement.scrollTop = 150;
  preText.nodeValue = "abcd efg ";
  assert_equals(document.scrollingElement.scrollTop, 250);
}, "Anchoring with text wrapping changes.");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-anchoring/abspos-in-multicol-001.html