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<html><head><style>#myDiv { border: 1px solid red; outline: green dotted thick;}</style></head><body><div id="myDiv">This is a div element.</div><br><button type="button" onclick="myFunction()">Change outline style</button><script> function myFunction() { document.getElementById("myDiv").style.outlineStyle = "solid"; }</script></body><!-- /jsref/tryit.asp?filename=tryjsref_style_outlinestyle2 </html>