| <!DOCTYPE html> |
| <html> |
| <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1947223"> |
| <style> |
| html { |
| width: 200vw; |
| height: 200vh; |
| } |
| .fixed { |
| position: fixed; |
| top: 0px; |
| left: -200px; |
| width: 100px; |
| height: 100px; |
| overflow: scroll; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| } |
| </style> |
| <div class="fixed"> |
| <div id="target"></div> |
| <div style="height: 200vh"></div> |
| </div> |
| <script> |
| promise_test(async t => { |
| assert_equals(window.scrollY, 0); |
| assert_equals(visualViewport.pageTop, 0); |
| |
| // Scroll the root scroll container a bit. |
| const scrollPromise = |
| new Promise(resolve => window.addEventListener("scroll", resolve)); |
| window.scrollTo(0, 10); |
| await scrollPromise; |
| assert_equals(window.scrollY, 10); |
| assert_equals(visualViewport.pageTop, 10); |
| |
| window.addEventListener("scroll", () => { |
| assert_unreached("Any scroll event should not be observed"); |
| }); |
| |
| // Now trigger a scrollIntoView call to an element inside a position:fixed element. |
| // NOTE: smooth scroll is a trigger of the firefox bug. |
| document.querySelector('#target').scrollIntoView({ behavior: "smooth" }); |
| |
| // Wait four rAFs to give a chance the scrollIntoView scrolls this document. |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| await new Promise(resolve => requestAnimationFrame(resolve)); |
| |
| assert_equals(window.scrollY, 10); |
| assert_equals(visualViewport.pageTop, 10); |
| }, "Element.scrollIntoView doesn't scroll a position:fixed element outside of the layout viewport"); |
| </script> |
