Run HTML code Snippet on Button Click

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Is there a way to run a snippet of HTML whenever a certain button assigned to that code is clicked?

The code adds a particular item to a shopping cart, which appears in a new tab or pop up.

I am recreating an existing website using Bootstrap 4.1.1, jQuery, and CSS.

Thank you,
Chris

Hey Chris,
I just want to make sure that I understand what you are hoping to do. So when you click a button you want to add an item to a shopping cart that changes HTML somewhere else on the site to reflect that, is that correct? Do you have your code on GitHub or similar (GitLab, BitBucket)? If I am correct in my understanding, then there are great deal possible paths to success so it would be helpful to see what you currently have. Look forward to hearing from you.

Justin