HTML Design
<div class="custom-container color-red">
<h3>Hello, I am a customized container</h3>
</div>
Javascript Logic
let element = document.getElementsByClassName('custom-container')[0];
let classes = element.classList;
Array.from(classes)[0] = "background";
"Arrays are mutable and can be changed. However, the first item in the array is not being replaced with 'background' as expected."
Using Array.from enables the creation of a fresh array based on the elements in classList, which is an object of type DOMTokenList.
In case you need to eliminate the first element, follow these steps:
let div = document.getElementsByClassName('container')[0];
let a = div.classList;
a.remove(a.item(0))
After that, you are free to add the required element like so:
a.add("font");
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