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Finally, by looking at other scripts on other J3 sites, I find that I have to wrap the code like this and it works: window.onload=function() { // original code as above } (although I still have the cross-site cookie notices, but I think that's another issue...)


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I'm not sure why it would be working in J4, but not J3. That said, you're unecessarily using nested for loops, rather than a single forEach iterator. You can use the following: // Create an array using Array.from(), so that we can filter later on const toggles = Array.from(document.querySelectorAll('.toggle-form')); // Iterate over the array toggles.forEach(...


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