Check 14 / 18 LOW impact In the full checklist
Sticky checkout bar on cart page mobile
What this check is
On a phone the checkout button scrolls out of view as soon as the cart has a few lines. A sticky bar keeps the total and the action visible while the shopper reviews the items.
How to implement it
Fix a bar to the bottom of the cart page on mobile carrying the order total and the checkout action, positioned above the safe-area inset and the cookie banner, and hide it when the on-page button is already visible.
How to verify it
Fill a cart with four items on a 390px viewport, scroll to the bottom and confirm the sticky bar shows the same total and that tapping it reaches the checkout.
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