Remove CSS class from element with JavaScript (no

Question

This question already has an answer here:

• How to change an element's class with JavaScript? 25 answers

Could anyone let me know how to remove a class on an element using JavaScript only? Please do not give me an answer with jQuery as I can't use it, and I don't know anything about it.

Answer 1

document.getElementById("whatever").className += "classToKeep";

With the plus sign ('+') appending the class as opposed to overwriting any existing classes