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<!DOCTYPE html>
<
html
>
<
body
>
<
div
id=
"divId"
class=
"someClass "
>
<
p
>Add new classes</
p
>
</
div
>
<
script
>
let
cName
= document.getElementById(
"divId"
);
cName.className +=
"otherClass"
;
alert(cName.className);
</
script
>
</
body
>
</
html
>
<!DOCTYPE html> <html> <body> <div id="divId" class="someClass "> <p>Add new classes</p> </div> <script> let cName = document.getElementById("divId"); cName.className += "otherClass"; alert(cName.className); </script> </body> </html>