https://schema. org/{%ifproduct. selected_or_first_available_variant. available%}InStock{%else%}OutOfStock{%endif%} {{shop. url}}{{product. selected_or_first_available_variant. url}} {%ifvariant. available%}https://schema. org/InStock{%else%}https://schema. org/OutOfStock{%endif%} When a human visits a Shopify product page, understanding product variants is seamless. 5" or "Olive Green," client-side JavaScript listens to the change event, updates the DOM, modifies the URL parameter, and checks live stock status via the Ajax Cart API.