| <!DOCTYPE html> |
| <title>position:sticky should operate correctly for the root scroller</title> |
| <link rel="help" href="https://drafts.csswg.org/css-position-3/#valdef-position-sticky"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#propdef-scroll-behavior"> |
| <meta name="assert" content="This test checks that position:sticky elements work when using the root (document) scroller which has `scroll-behavior` property" /> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/scroll-behavior.js"></script> |
| |
| <style> |
| html { |
| scroll-behavior: smooth; |
| } |
| |
| body { |
| /* Assumption: 3000px is taller than any user agents test window size. */ |
| height: 3000px; |
| /* A property which propagates for <html>. */ |
| overflow-x: hidden; |
| } |
| |
| #sticky { |
| position: sticky; |
| top: 50px; |
| width: 200px; |
| height: 200px; |
| background-color: green; |
| } |
| </style> |
| |
| <div id="sticky"></div> |
| |
| <script> |
| promise_test(async () => { |
| window.scrollTo(0, 700); |
| |
| await waitForScrollEnd(document.scrollingElement); |
| |
| assert_equals(sticky.offsetTop, 700 + 50); |
| }, 'Sticky elements work with the root (document) scroller'); |
| </script> |
