| <!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(Math.round(bounds.left + bounds.width / 2), |
| Math.round(bounds.top + bounds.height / 2), 0, -100) |
| .send(); |
| |
| // Await two animation frames to give a chance to scroll. |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| |
| assert_equals(window.scrollY, originalScrollPos, "overscroll-behavior should work on the root"); |
| }); |
| </script> |
