| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <style> |
| * { |
| box-sizing: border-box; |
| } |
| |
| body { |
| transform: translateZ(0px); |
| } |
| |
| .scroller { |
| position: relative; |
| margin: 20px; |
| width: 600px; |
| height: 580px; |
| overflow-x: hidden; |
| overflow-y: auto; |
| perspective-origin: right bottom; |
| perspective: 1px; |
| border: 1px solid black; |
| } |
| |
| .preserve3d { |
| transform-origin: top left; |
| transform-style: preserve-3d; |
| } |
| |
| .box { |
| height: 12000px; |
| background-color: rgba(0, 0, 0, 0.2); |
| } |
| |
| .parallax { |
| background-size: cover; |
| box-sizing: border-box; |
| width: 80%; |
| margin-left: 20px; |
| height: 1300px;; |
| /* Since the parallax elements still consume space, we set the margin to undo |
| the height of this parallax element making it essentially consume 0 space. |
| */ |
| margin-bottom: -1300px; |
| } |
| |
| .tester { |
| position: relative; |
| z-index: 1; |
| background-color: green; |
| margin-top: 200px; |
| height: 600px; |
| width: 100%; |
| will-change: transform; |
| } |
| |
| .filler { |
| background-color: silver; |
| } |
| </style> |
| <script> |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| testRunner.dumpAsText(); |
| } |
| |
| window.addEventListener('load', () => { |
| setTimeout(() => { |
| let scroller = document.querySelector('.scroller'); |
| scroller.scrollTop = 400; |
| |
| if (window.internals) |
| document.getElementById('layers').innerText = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_BACKING_STORE_ATTACHED); |
| |
| if (window.testRunner) |
| testRunner.notifyDone(); |
| }, 0); |
| }, false); |
| </script> |
| </head> |
| <body> |
| <div class="scroller"> |
| <div class="preserve3d"> |
| <div class="parallax" style="transform: translate3d(0px, -220px, -2px);"></div> |
| <div class="box tester"> </div> |
| <div class="box filler"></div> |
| </div> |
| </div> |
| <pre id="layers"></pre> |
| </body> |
| </html> |
