clipped-scrollers-skipped.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-anchoring/clipped-scrollers-skipped.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

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

<style>

body { height: 2000px; }

#scroller { overflow: scroll; width: 500px; height: 300px; }

.anchor {

  position: relative; height: 100px; width: 150px;

  background-color: #afa; border: 1px solid gray;

#forceScrolling { height: 500px; background-color: #fcc; }

</style>

<div id="scroller">

  <div id="innerChanger"></div>

  <div id="innerAnchor" class="anchor"></div>

  <div id="forceScrolling"></div>

</div>

<div id="outerChanger"></div>

<div id="outerAnchor" class="anchor"></div>

<script>

// Test that we ignore the clipped content when computing visibility otherwise

// we may end up with an anchor that we think is in the viewport but is not.

test(() => {

  document.querySelector("#scroller").scrollTop = 100;

  document.scrollingElement.scrollTop = 350;

  document.querySelector("#innerChanger").style.height = "200px";

  document.querySelector("#outerChanger").style.height = "150px";

  assert_equals(document.querySelector("#scroller").scrollTop, 300);

  assert_equals(document.scrollingElement.scrollTop, 500);

}, "Anchor selection with nested scrollers.");

</script>