| <html> |
| <head> |
| <style> |
| header { |
| position: fixed; |
| left: 0px; |
| right: 0px; |
| top: 0px; |
| height: 50px; |
| width: 400px; |
| background-color: silver; |
| } |
| |
| .container |
| { |
| position: absolute; |
| left: 50px; |
| top: 30px; |
| background-color: silver; |
| width: 300px; |
| z-index: 1; |
| } |
| |
| .child { |
| width: 100%; |
| height: 50px; |
| background-color: green; |
| } |
| |
| body.changed .composited { |
| transform: translateZ(0); |
| } |
| </style> |
| <script> |
| |
| window.addEventListener('load', () => { |
| setTimeout(() => { |
| document.body.classList.add('changed'); |
| }, 0) |
| }, false); |
| </script> |
| </head> |
| <body> |
| <header> |
| |
| <div class="container"> |
| <div class="child"> </div> |
| <div class="child"> </div> |
| <div class="composited child"> </div> |
| </div> |
| </header> |
| </body> |
| </html> |
