| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>CSS will-change: 'will-change: perspective' creates a containing block for fixed positioned elements</title> |
| <link rel="author" title="L. David Baron" href="https://dbaron.org/"> |
| <link rel="author" title="Mozilla" href="http://www.mozilla.org/"> |
| <link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change"> |
| <link rel="help" href="http://www.w3.org/TR/css3-transforms/#perspective-property"> |
| <link rel="match" href="green-square-100-by-100-offset-ref.html"> |
| <meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements."> |
| <style> |
| html, body { margin: 0; padding: 0; } |
| div { width: 100px; height: 100px } |
| #wc { will-change: perspective; margin: 100px 0 0 100px; background: red } |
| .child { top: 0; left: 0; width: 50px; background: green } |
| #fixpos { position: fixed } |
| #abspos { position: absolute; left: 50px } |
| </style> |
| <body> |
| <div id="wc"> |
| <div class="child" id="fixpos"> |
| </div> |
| <div class="child" id="abspos"> |
| </div> |
| </div> |
| </body> |
