Change the outline style of a <div> element:
document.getElementById("myDiv").style.outlineStyle = "solid";
<!DOCTYPE html> <html> <head> <style> #myDiv {//from w w w . j av a 2 s .c o m 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> </html>