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<html><body><div id="myDiv" style="border-right:thick solid red">This is a div element.</div><br><button type="button" onclick="myFunction()">Return the width of the right border</button><script>function myFunction() { alert(document.getElementById("myDiv").style.borderRightWidth);}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_borderrightwidth3 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:50 GMT --></html>