<!DOCTYPE html> <html lang="en"> <meta charset="utf-8"> <title>The fixed background should not cause .inner to move to a different layer than .outer</title> <style> body { margin: 0; height: 3000px; } .outer { border: 1px solid black; margin: 10px; } .outer > div { margin: 10px; } .fixed-bg { height: 100px; background-image: linear-gradient(lime, lime); background-attachment: fixed; } .inner { border: 1px solid blue; padding: 20px; } </style> <div class="outer" reftest-assigned-layer="page-background"> <!-- .inner and .fixed-bg do not overlap, so .inner should be merged into the same layer as .outer. --> <div class="fixed-bg"></div> <div class="inner" reftest-assigned-layer="page-background"></div> </div>