scroll-position-root-child-ib-split-insertion.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /css/cssom-view/scroll-position-root-child-ib-split-insertion.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>Root scroll position is preserved when repeatedly inserting and removing an ib-split on the root element</title>

<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-window-scrolly">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=2081016">

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

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

<style>

  body { margin: 0; }

  #tall { height: 5000px; }

</style>

<div id="tall"></div>

<script>

const tick = () => new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r)));

function makeIBSplit() {

  const span = document.createElement("span");

  const div = document.createElement("div");

  div.textContent = "x";

  span.appendChild(div);

  return span;

promise_test(async () => {

  window.scrollTo(0, 800);

  await tick();

  assert_equals(window.scrollY, 800, "Initial scroll position");

  for (let i = 0; i < 4; i++) {

    const span = makeIBSplit();

    document.documentElement.appendChild(span);

    await tick();

    assert_equals(window.scrollY, 800, `Scroll position after insertion ${i}`);

    span.remove();

    await tick();

    assert_equals(window.scrollY, 800, `Scroll position after removal ${i}`);

});

</script>