| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>CSS Containment Test: Layout containment fixed positioned descendants</title> |
| <link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout"> |
| <link rel="match" href="reference/contain-layout-021-ref.html"> |
| <meta name=assert content="Layout containment makes an element to act as containing block for fixed positioned descendants."> |
| <style> |
| html { |
| contain: layout; |
| } |
| #fixed { |
| position: fixed; |
| background: green; |
| width: 100px; |
| height: 100px; |
| } |
| body { |
| height: 3000px; |
| margin: 0px; |
| } |
| #spacer { |
| height: 200px; |
| } |
| </style> |
| <script> |
| function runTest() { |
| document.documentElement.scrollTop += 200; |
| } |
| </script> |
| <body onload="runTest()"> |
| <div id="spacer"></div> |
| <p>Test passes if there is a filled green square and <strong>no red</strong>.</p> |
| <div id="fixed"></div> |
| </body> |