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I have 20 checkbox options (added via custom options) available so the customer can customise the product. I would like to make sure the customer has ticked/checked at least 6 of the checkboxes.

I have written some JS to count how many of the options have been checked and highlight the options in red if fewer than six have been selected, but how do I integrate that JS so the Add to Cart button will run my custom JS as well as the usual validation?

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