<!DOCTYPE HTML> <head> <meta charset="UTF-8"> <title>CSS Test Reference: dynamic changes to offset properties</title> <link rel="author" title="L. David Baron" href="https://dbaron.org/"> <link rel="author" title="Mozilla" href="https://www.mozilla.org/"> <style> body { margin: 0; } #container { position: absolute; width: 100px; height: 100px; background: yellow; } #abspos { margin-top: 10px; margin-left: 70px; width: 10px; height: 10px; background: fuchsia; } </style> <div id="container"> <div id="abspos"></div> </div>