Check 14 / 16 LOW impact In the full checklist
Sticky header with cart count animation
What this check is
A sticky header keeps search, menu and cart reachable at any scroll depth, and a count that animates on add-to-cart confirms the action happened without a checkout visit.
How to implement it
Make the header stick with a condensed state after scrolling, keep the cart icon and count in the same position in both states, and animate the count and the icon briefly on add-to-cart. On mobile consider hiding the sticky header while scrolling down and revealing it on scroll up.
How to verify it
Scroll down a product page, add to cart and confirm the header count increments with the animation and that the sticky header does not cover the page title when you jump to an anchor.
All 197 checks, one Google Sheet
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