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<html><head><style>#myDiv { border-style: solid;}</style></head><body><div id="myDiv">This is a div element.</div><br><button type="button" onclick="myFunction()">Change width of the top border</button><script> function myFunction() { document.getElementById("myDiv").style.borderTopWidth = "thin"; }</script></body><!-- /jsref/tryit.asp?filename=tryjsref_style_bordertopwidth2 Thu, 06 Feb 2025 18:36:38 GMT --></html>