overscroll-behavior-root.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-overscroll-behavior/overscroll-behavior-root.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>overscroll-behavior in root works</title>

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

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

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

<script src="/resources/testdriver-actions.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

<script src="/css/css-scroll-snap/support/common.js"></script>

<link rel="help" href="https://drafts.csswg.org/css-overscroll-behavior">

<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=954423">

<div style="height: 200vh"></div>

<iframe srcdoc="<style>:root { overscroll-behavior-y: contain }</style><div style='height: 200vh'></div>"></iframe>

<script>

promise_test(async function() {

  await new Promise(r => window.addEventListener("load", r, { once: true }));

  const iframe = document.querySelector("iframe");

  iframe.scrollIntoView();

  const bounds = iframe.getBoundingClientRect();

  const originalScrollPos = window.scrollY;

  assert_equals(typeof originalScrollPos, "number", "Scroll position should be a number");

  assert_not_equals(originalScrollPos, 0, "Should have scrolled to get the iframe into view");

  await new test_driver.Actions()

    .scroll(bounds.left + bounds.width / 2, bounds.top + bounds.height / 2, 0, -100)

    .send();

  assert_equals(window.scrollY, originalScrollPos, "overscroll-behavior should work on the root");

});

</script>