<!DOCTYPE html> <html> <head> <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" /> <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="/dom/events/scrolling/scroll_support.js"></script> </head> <body> <style> #scroller { width: 200px; height: 400px; overflow-y: scroll; scroll-snap-type: y mandatory; background-color: blue; } #snap_target { width: 100px; height: 1942.5px; scroll-snap-align: start; background-color: pink; } </style> <div id="scroller"> <div id="snap_target"></div> </div> <script> promise_test(async (t) => { await waitForCompositorCommit(); let scrollend_promise = new Promise((resolve) => { scroller.addEventListener("scrollend", resolve); }); let scroll_promise = new Promise((resolve) => { scroller.addEventListener("scroll", resolve); }); await new test_driver.Actions().scroll(0, 0, 0, scroller.scrollHeight, { origin: scroller }).send(); await scroll_promise; await scrollend_promise; assert_approx_equals(scroller.scrollTop, scroller.scrollHeight - scroller.clientHeight, 1, "scroller is scrolled to its bottom and not its top."); }, "snapport covered by snap area doesn't jump"); </script> </body> </html>