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Is the last code snippet comment referring to data-toggle-content?
In this part:
// assign the element with the data attribute 'data-toggle-controller' to the variable 'toggler'
var toggler = document.querySelector('[data-toggle-controller]');
// assign the element with the data attribute 'data-toggle-controller' to the variable 'toggledContent'
var toggledContent = document.querySelector('[data-toggle-content]');