What’s the difference between interactivity (CSS) and AMP actions?
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Imagine you want to add a show/hide FAQ accordion to your email. CSS interactivity can do that, no extra infrastructure needed, no approval process, just a checkbox hack and some clever selectors. Now imagine you want that same email to show your subscriber's loyalty points balance pulled live from your API. That's where CSS hits a wall and AMP enters the picture.
CSS interactivity works by exploiting state changes in the document, typically the :checked pseudo-class tied to hidden checkbox inputs. You can toggle visibility, animate carousels, and reveal content without any JavaScript or server calls. It's purely presentational. The advantage is broad client support: CSS-based interactions work anywhere CSS is rendered, which covers most modern email clients including Apple Mail, Outlook on Mac, and most mobile clients. No approval process, no registration, just build it and ship it.
AMP for Email is a different beast. It gives emails a JavaScript-like action system where components can fetch live data, submit forms, and update content after the email lands in the inbox. An AMP accordion isn't just toggling CSS visibility; it can call your server. A product card can show real-time inventory. A survey can submit responses without the user leaving their inbox. But AMP only works in clients that have joined the approved ecosystem: Gmail, Yahoo Mail, and Mail.ru. And before your emails render as AMP, your sending domain needs approval from each provider, which involves submitting a production sample and meeting volume requirements.
The practical decision isn't about which is better; it's about what you need. For visual polish and engagement without backend dependencies, CSS-based interactivity is faster to ship and reaches more of your audience. For experiences that genuinely need live data or form submissions inside the inbox, AMP actions are the only real path, but budget time for the approval process and always build a fallback for non-AMP clients.
If you're just getting started with interactive email, build the CSS version first. You'll learn what your audience actually engages with before committing to AMP's heavier setup. When you're ready to evaluate AMP, check your subscriber's client mix first: if most of your audience uses Apple Mail or desktop Outlook, AMP won't reach them at all.
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