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can't seem to make this work, anybody did this. Please give me some advice. Thanks
I have tried too much, can't seem to make it work.
trio-group I.AM24,757 Points
First you need to select e.target's previous element sibling. Then use the className method on this selection to set the class to 'highlight'. This is an example of selecting the NEXT element sibling:
e.target.nextElementSibling.className = 'whatever-class-you-choose';
Hope this helps!