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An e-commerce site condenses into a few pages nearly all the challenges of visual testing: a catalog with thousands of dynamically generated product pages, a checkout funnel where the smallest regression directly costs conversion rate, critical mobile breakpoints (more than half of the traffic in most sectors), seasonal promotions that deeply alter the rendering without notice. A visual regression on the "Add to cart" button or on the strikethrough price display is not a detail — it is a measurable revenue loss.

The articles on this page cover e-commerce use cases for visual testing: smart coverage of a catalog too vast to be tested in full (sampling by category, by template), multi-step checkout management, validation of payment integrations (Stripe, PayPal) without breaking capture determinism, control of promotional banners and A/B tests that pollute baselines. We also address constraints specific to Shopify, Magento, PrestaShop or WooCommerce platforms, and the pitfalls of heavily customized themes. Delta-QA lends itself well to validating a store in pre-production or final UAT, complementing a broader CI strategy on critical components.