| <!DOCTYPE html> |
| <title>translations on position:sticky elements should apply after sticking</title> |
| <link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" /> |
| <meta name="assert" content="This test checks that translations on position:sticky elements are carried out on their stuck position" /> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <script src="resources/sticky-util.js"></script> |
| |
| <body style="margin: 0;"></body> |
| |
| <script> |
| test(() => { |
| const elements = setupStickyTest('top', 50); |
| elements.sticky.style.transform = 'translateY(-100%)'; |
| elements.scroller.scrollTop = 100; |
| // Transforms don't affect offsetTop, so use getBoundingClientRect. |
| assert_equals(elements.sticky.getBoundingClientRect().y, |
| elements.scroller.getBoundingClientRect().y); |
| }, 'Translation transform can move sticky element past sticking point'); |
| |
| test(() => { |
| const elements = setupStickyTest('top', 50); |
| elements.sticky.style.transform = 'translateY(50%)'; |
| elements.scroller.scrollTop = 200; |
| // Transforms don't affect offsetTop, so use getBoundingClientRect. |
| const stickyElementOffset = elements.sticky.getBoundingClientRect().y - |
| elements.scroller.getBoundingClientRect().y; |
| assert_equals(stickyElementOffset, 100); |
| }, 'Stuck elements can still be moved via translations'); |
| |
| test(() => { |
| const elements = setupStickyTest('top', 50); |
| elements.container.style.transform = 'translateY(100px)'; |
| elements.scroller.scrollTop = 200; |
| // Transforms don't affect offsetTop, so use getBoundingClientRect. |
| // Here the sticky element will originally have stuck at 50px from the top, |
| // but is then 'pulled' downwards by the 100px container transform. |
| const stickyElementOffset = elements.sticky.getBoundingClientRect().y - |
| elements.scroller.getBoundingClientRect().y; |
| assert_equals(stickyElementOffset, 150); |
| }, 'The sticky element should stick before the container is offset by a ' + |
| 'translation'); |
| </script> |
