| <!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] --> |
| <html> |
| <head> |
| <style> |
| #scroller { |
| position: absolute; |
| top: 20px; |
| left: 20px; |
| width: 500px; |
| height: 400px; |
| border: 2px solid gray; |
| overflow-y: scroll; |
| background-color: rgba(255, 255, 255, 0.5); |
| box-sizing: border-box; |
| } |
| |
| .fixed { |
| position: fixed; |
| left: 0px; |
| top: -200px; /* outside the viewport */ |
| width: 200px; |
| height: 100px; |
| } |
| |
| .box { |
| position: absolute; |
| top: 210px; |
| left: 10px; |
| width: 300px; |
| height: 100px; |
| background-color: green; |
| } |
| |
| .contents { |
| position: absolute; |
| left: 35px; |
| top: 28px; |
| width: 90%; |
| height: 300%; |
| } |
| |
| .outside-box { |
| position: absolute; |
| overflow: hidden; |
| top: 20px; |
| left: 530px; |
| width: 20px; |
| height: 400px; |
| background-color: silver; |
| } |
| |
| #header { |
| position: relative; |
| background-color: blue; |
| width: 100%; |
| height: 20px; |
| } |
| </style> |
| <script> |
| if (window.testRunner) |
| testRunner.waitUntilDone(); |
| |
| window.addEventListener('load', () => { |
| const scroller = document.getElementById('scroller'); |
| scroller.addEventListener('scroll', () => { |
| const scrollPos = scroller.scrollTop; |
| const header = document.getElementById('header'); |
| header.style.top = `-${scrollPos}px`; |
| }, false); |
| |
| requestAnimationFrame(() => { |
| scroller.scrollTop = 100; |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }) |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div id="scroller"> |
| <div class="contents"> |
| <div class="fixed"></div> |
| <div class="box"></div> |
| </div> |
| </div> |
| <div class="outside-box"> |
| <div id="header">relative</div> |
| </div> |
| </body> |
