<!DOCTYPE html> <title> offset-path animation creates a stacking context even though it has only 'offset-path:none' keyframes </title> <style> span { height: 100px; width: 100px; position: fixed; background: green; top: 50px; } @keyframes OffsetPathNone { from, to { offset-path: none } } #test { width: 100px; height: 100px; background: blue; animation: OffsetPathNone 100s infinite; } </style> <span></span> <div id="test"></div>