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Lightbox Videos to include Closed Captions

I’ve got a video lightbox that I need to use Closed Captions by default. I’ve found some javascript online to add CC, but it references the name of an iframe. Is Webflow using an iframe? If so, how can I get the id of the iframe in use to include in my custom code, javascript?

Here’s where I found the code: Youtube Player iFrame API - JSFiddle - Code Playground

Here is my site Read-Only: Webflow - The Logan School