support collapse - code helper

support collapse/by Tomek Makowski

Preview size
Default Moto G4 Galaxy S5 Pixel 2 Pixel 2 XL iPhone 5/SE iPhone 6/7/8 iPhone 6/7/8 Plus iPhone X iPad iPad Pro Surface Duo Galaxy Fold

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HTML
CSS
JS

<!-- Collapse buttons -->

$('#collapseExample').on('show.bs.collapse', function () {

Console errors: 0