I would like to access the class list of the html element (that is in this case I'd like to know if my-class is set on html):
<html class="my-class">
...
</html>
How can I do that with JavaScript?
Select the element and then classList:
document.querySelector('html').classList or if you have multiple clsases in your element then you can select by class to get the other classes from this element too.
document.querySelector('.my-class').classList