<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!DOCTYPE html> <meta charset="utf-8"> <title>Test that overlay scrollbars are covered by positioned siblings with higher z-index even when the scrollable frame has a positioned descendant</title> <style> #outer { width: 200px; height: 200px; overflow: auto; } #content { height: 400px; background: cyan; position: relative; z-index: 1; } #cover { width: 200px; height: 200px; background: cyan; position: absolute; z-index: 2; } </style> <div id="cover"></div> <div id="outer"><div id="content"></div></div>