classList.add
classList.add
classList is the DOM API for working with an element's classes. classList.add adds one class without replacing the others.
That is safer than assigning the whole className string when the element already has layout, theme, or state classes you need to keep.
Your task: Select the current step and add the is-current class to it. Keep its existing step class.
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classList.add
classList is the DOM API for working with an element's classes. classList.add adds one class without replacing the others.
That is safer than assigning the whole className string when the element already has layout, theme, or state classes you need to keep.
Your task: Select the current step and add the is-current class to it. Keep its existing step class.