“Checkout” is a link styled to call users to action.
But sometimes links look like buttons (and buttons look like links)
Adam Silver

In this instance isn’t “Checkout” closer to a button than a link? It might technically link to a page but you’ve got items and quantity fields and you are initiating a process by submitting those items in the cart to your checkout page. The appearance of a button might suggest more finality but there are plenty of multipage forms.

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