focused-element-nested-anchor.html | Explore in Territory

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

body { height: 4000px; }
div { height: 100px; }

.scroller {
  overflow: scroll;
  position: fixed;
  width: 300px;
  height: 300px;
  background-color: green;
}

#posSticky {
  top: 300px;
  position: relative;
  height: 50px;
  width: 50px;
  background-color: blue;
}

#content {
  background-color: #D3D3D3;
  height: 50px;
  width: 50px;
  position: relative;
  top: 500px;
}

#anchor {
  background-color: brown;
  height: 50px;
  width: 50px;
  position: relative;
  top: 200px;
}

</style>
<div id="scroller" class="scroller">
    <div id="content" tabindex="-1"></div>
    <div id="anchor" tabindex="-1"></div>
</div>

<script>

// Tests that a focused element doesn't become the
// priority candidate of the main frame if it is
// the anchor element of a subscroller

promise_test(async function() {
  var scroller = document.querySelector("#scroller");
  var focusElement = document.querySelector("#anchor");
  focusElement.focus();
  scroller.scrollBy(0,150);
  document.scrollingElement.scrollBy(0,100);

  scroller.scrollBy(0, 50);
  await new Promise(resolve => {
     scroller.addEventListener("scroll", () => step_timeout(resolve, 0));
   });

  assert_equals(document.scrollingElement.scrollTop, 100);
}, "Ensure there is no scroll anchoring adjustment in the main frame.");

</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-anchoring/focused-element-nested-anchor.html
