| <!DOCTYPE HTML> |
| <html> |
| <head> |
| <script> |
| // Disable implicit root scroller since the outer div is full screen |
| // and would otherwise be promoted to rootScroller. Doing so causes it |
| // to be composited and produces off-by-one differences due to how |
| // scrollbar positions are calculated in the compositor. |
| internals.runtimeFlags.implicitRootScrollerEnabled = false; |
| </script> |
| <style> |
| body { |
| margin: 0px; |
| overflow:hidden; |
| } |
| |
| #outer-scrollable { |
| position: absolute; |
| top: 0px; |
| left: 0px; |
| right: 0px; |
| bottom: 0px; |
| overflow: scroll; |
| } |
| |
| #tall { |
| height: 1000px; |
| } |
| |
| #inner-scrollable { |
| position: relative; |
| overflow: auto; |
| width: 200px; |
| height: 200px; |
| z-index: 0; |
| } |
| |
| #content { |
| width: 300px; |
| height: 300px; |
| background-color: blue; |
| margin: 0px; |
| will-change:transform; |
| } |
| </style> |
| <script> |
| function doTest() { |
| // This test succeeds if the scrollbars on the inner-scrollable |
| // are positioned properly. |
| var scroller = document.getElementById("outer-scrollable"); |
| scroller.scrollTop = 100; |
| } |
| window.addEventListener("load", doTest, false); |
| </script> |
| </head> |
| <body> |
| <div id="outer-scrollable"> |
| <div id="tall"> |
| <div id="inner-scrollable"> |
| <div id="content"></div> |
| </div> |
| </div> |
| </div> |
| </body> |
| </html> |
