<!DOCTYPE html> <!-- Any copyright is dedicated to the Public Domain. - http://creativecommons.org/publicdomain/zero/1.0/ --> <html> <head> <title>CSS Test: Sticky Positioning - stacking context</title> <link rel="author" title="Corey Ford" href="mailto:cford@mozilla.com"> <link rel="match" href="stacking-context-1-ref.html"> <meta name="assert" content="Sticky positioning should establish a stacking context"> <style> body { margin: 0; } div { width: 100px; height: 100px; } #static { position: absolute; top: 20px; left: 20px; background-color: blue; z-index: 1; } #sticky { position: sticky; top: 0; left: 0; background-color: black; } #inner { position: relative; top: 40px; left: 40px; background-color: gray; z-index: 2; } </style> <body> <div id="static"></div> <div id="sticky"> <div id="inner"></div> </div> </body> </html>