add a class to a div with an id javascript

a one liner to add a class name to an element with a specific id, for this to run it seems to need a document ready.


<button id="Login_Button">Hi Im a Button</button>


document.addEventListener("DOMContentLoaded", function(event) { 
  document.getElementById("Login_Button").className += " btn btn-sm btn-outline-success";



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This is my test area for webdev. I keep a collection of code snippits here, mostly for my reference. Also if i find a good site, i usually add it here.