| <!DOCTYPE html> |
| <html> |
| <head> |
| <style> |
| body, html { |
| height: 100%; |
| width: 100%; |
| margin: 0; |
| } |
| .section { |
| height: 2000px; |
| } |
| .overlay { |
| position: fixed; |
| left: 0; |
| top: 0; |
| width: 400px; |
| height: 100px; |
| background-color: blue; |
| } |
| </style> |
| <script> |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| function doTest() |
| { |
| window.scrollTo(0, 200); |
| requestAnimationFrame(() => { |
| document.body.style.top = -window.scrollY + 'px'; |
| document.body.style.position = 'fixed'; |
| |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }); |
| } |
| |
| window.addEventListener('load', doTest, false); |
| </script> |
| </head> |
| <body> |
| <div class="section"></div> |
| <div class="overlay"></div> |
| </body> |
| </html> |
| |
