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<html><head><style>#myDiv { border: 1px solid red;}</style></head><body><div id="myDiv">This is a div element.</div><br><button type="button" onclick="myFunction()">Set outline style</button><script>function myFunction() { document.getElementById("myDiv").style.outlineStyle = "dotted";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_outlinestyle by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:19:37 GMT --></html>