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| 1 <!-- Based on compositing/overflow/fixed-scroll-in-empty-root-layer.html --> |  | 
| 2 <!DOCTYPE html> |  | 
| 3 <script src="resources/paint-invalidation-test.js"></script> |  | 
| 4 <script> |  | 
| 5 function paintInvalidationTest() { |  | 
| 6   window.scrollBy(0, 200); |  | 
| 7 } |  | 
| 8 onload = runPaintInvalidationTest; |  | 
| 9 </script> |  | 
| 10 <body style="height: 2000px"> |  | 
| 11   Tests invalidation of fixed element when scrolled in a page with empty root la
    yer. Passes if there is no red. |  | 
| 12   <div style=" |  | 
| 13     position: fixed; |  | 
| 14     top: 50px; |  | 
| 15     left: 0; |  | 
| 16     width: 100px; |  | 
| 17     height: 100px; |  | 
| 18     background: green"> |  | 
| 19   </div> |  | 
| 20   <!-- This div makes all of the contents of the page be in sublayers of the roo
    t layer, so root layer is empty. --> |  | 
| 21   <div style=" |  | 
| 22     position: absolute; |  | 
| 23     z-index: -1; |  | 
| 24     backface-visibility: hidden; |  | 
| 25     top: 250px; |  | 
| 26     left: 0; |  | 
| 27     background-color: red; |  | 
| 28     width: 100px; |  | 
| 29     height: 100px"> |  | 
| 30   </div> |  | 
| 31 </body> |  | 
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