| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| html { |
| overflow: hidden; /* hide scrollbars */ |
| } |
| |
| body { |
| margin: 0; |
| } |
| |
| .container { |
| height: 2000px; |
| } |
| |
| .box { |
| height: 50px; |
| } |
| |
| .sticky { |
| position: sticky; |
| top: 50px; |
| background-color: green; |
| } |
| </style> |
| <script> |
| if (window.testRunner) |
| testRunner.waitUntilDone() |
| |
| function doTest() |
| { |
| const sticky = document.querySelector('.sticky'); |
| sticky.style.position = 'relative'; |
| |
| // Force layout. |
| sticky.offsetTop; |
| |
| sticky.style.position = 'sticky'; |
| |
| window.requestAnimationFrame(function() { |
| window.scrollTo(0, 100); |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }); |
| } |
| |
| window.addEventListener('load', function() { |
| // We require the compositings inputs to be clean (and thus the initial |
| // sticky position to be calculated) before we stat changing things. |
| // Force this by waiting for a double rAF. |
| window.requestAnimationFrame(function() { |
| window.requestAnimationFrame(doTest); |
| }); |
| }); |
| </script> |
| </head> |
| <body> |
| <div class="container"> |
| <div class="sticky box"></div> |
| </div> |
| </body> |
| </html> |
