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<html><head><style>#myDiv { border: 1px solid #FF0000;}</style></head><body><div id="myDiv">This is a div.</div><br><button type="button" onclick="myFunction()">Set top margin</button><script>function myFunction() { document.getElementById("myDiv").style.marginTop = "50px";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_margintop by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:52 GMT --></html>