Apply a selector design process that anchors on semantic containers and validates extracted values.
Extract product price from a public product card that may receive badges, experiments, and layout changes. Anchor on row identity, prefer semantic data, parse typed values, and fail loudly when validation breaks. Copying a full CSS path from browser tools records layout position, not field meaning. It works until a wrapper, badge, or experiment shifts the sibling order. Find the row container Select the product card by a stable product identifier such as data-sku or a canonical product URL. A field is safer when it is extracted inside the correct row. Container identity prevents a nearby badge or recommendation from…
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