overscroll-behavior-root.html (1684B)
1 <!doctype html> 2 <meta charset="utf-8"> 3 <title>overscroll-behavior in root works</title> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="/resources/testdriver.js"></script> 7 <script src="/resources/testdriver-actions.js"></script> 8 <script src="/resources/testdriver-vendor.js"></script> 9 <script src="/css/css-scroll-snap/support/common.js"></script> 10 <link rel="help" href="https://drafts.csswg.org/css-overscroll-behavior"> 11 <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=954423"> 12 13 <div style="height: 200vh"></div> 14 15 <iframe srcdoc="<style>:root { overscroll-behavior-y: contain }</style><div style='height: 200vh'></div>"></iframe> 16 17 <script> 18 promise_test(async function() { 19 await new Promise(r => window.addEventListener("load", r, { once: true })); 20 21 const iframe = document.querySelector("iframe"); 22 iframe.scrollIntoView(); 23 24 const bounds = iframe.getBoundingClientRect(); 25 26 const originalScrollPos = window.scrollY; 27 28 assert_equals(typeof originalScrollPos, "number", "Scroll position should be a number"); 29 assert_not_equals(originalScrollPos, 0, "Should have scrolled to get the iframe into view"); 30 31 await new test_driver.Actions() 32 .scroll(Math.round(bounds.left + bounds.width / 2), 33 Math.round(bounds.top + bounds.height / 2), 0, -100) 34 .send(); 35 36 // Await two animation frames to give a chance to scroll. 37 await new Promise(resolve => requestAnimationFrame(resolve)); 38 await new Promise(resolve => requestAnimationFrame(resolve)); 39 40 assert_equals(window.scrollY, originalScrollPos, "overscroll-behavior should work on the root"); 41 }); 42 </script>